22 Logic Puzzle Questions To Challenge Your Mind!
Jane Ng • 31 August, 2023 • 8 min read
Looking for Logic puzzle questions to challenge your logic skills without breaking a sweat? You’re in the right place! In this blog post, we’ll provide a list of 22 delightful logic puzzle questions that will make you think, and ponder as you find their right answers. So, gather ’round, get comfy, and let’s embark on a journey into the world of riddles and brain teasers!
Table Of Contents
Level #1 – easy logic puzzle questions, level #2 – logic puzzle questions in math , level #3 – logic puzzle questions for adults, key takeaways.
1/ Question: If an electric train is moving north at 100 mph and the wind is blowing to the west at 10 mph, which way does the smoke from the train go? Answer: Electric trains don’t produce smoke.
2/ Question: Three friends – Alex, Phil Dunphy, and Claire Pritchett – went to a movie. Alex sat next to Phil, but not next to Claire. Who sat next to Claire? Answer: Phil sat next to Claire.
3/ Question: There are six glasses in a row. The first three are filled with milk, and the next three are empty. Can you rearrange six glasses so that the full and empty glasses are in alternating order by moving only one glass?
Answer: Yes, pour milk from the second glass into the fifth glass.
4/ Question: A man stands on one side of a river, his dog on the other. A man calls his dog, who immediately traverses the river without getting wet. How did the dog do it? Answer: The river was frozen, so the dog walked across the ice.
5/ Question: Sara is twice as old as Mike. If Mike is 8 years old, how old is Sara? Answer: Sara is 16 years old.
6/ Question: Four people need to cross a rickety bridge at night. They have only one flashlight and the bridge can only hold two people at a time. The four people walk at different speeds: one can cross the bridge in 1 minute, another in 2 minutes, the third in 5 minutes, and the slowest in 10 minutes. When two people cross the bridge together, they must go at the slower person’s pace. The speed of two people crossing a bridge together is limited by the speed of the slower person.
Answer: 17 minutes. First, the two fastest cross together (2 minutes). Then, the fastest returns with the flashlight (1 minute). The two slowest cross together (10 minutes). Finally, the second fastest returns with the flashlight (2 minutes).
7/ Question: A man gave one son 10 cents and another son was given 15 cents. What time is it? Answer: The time is 1:25 (a quarter past one).
8/ Question: If you multiply my age by 2, add 10, and then divide by 2, you’ll get my age. How old am I? Answer: You are 10 years old.
9/ Question: What is the weight of the three animals in the photo?
Answer: 27kg
10/ Question: If a snail climbs up a 10-foot pole during the day and then slips down 6 feet during the night, how many days will it take for the snail to reach the top?
Answer: 4 days. (On the first day, the snail climbs 10 feet during the day and then slips 6 feet during the night, leaving it at 4 feet. On the second day, it climbs another 10 feet, reaching 14 feet. On the third day, it climbs another 10 feet, reaching 24 feet. Finally, on the fourth day, it climbs the remaining 6 feet to reach the top.)
11/ Question: If you have 8 red balls, 5 blue balls, and 3 green balls in a bag, what is the probability of drawing a blue ball on the first try? Answer: The probability is 5/16. (There are a total of 8 + 5 + 3 = 16 balls. There are 5 blue balls, so the probability of drawing a blue ball is 5/16.)
12/ Question: A farmer has chickens and goats. There are 22 heads and 56 legs. What is the number of each animal that the farmer has? Answer: The farmer has 10 chickens and 12 goats.
13/ Question: How many times can you subtract 5 from 25? Answer : Once. (After subtracting 5 once, you’d be left with 20, and you can’t subtract 5 from 20 without going into negative numbers.)
14/ Question: What three positive numbers give the same answer when multiplied and added together? Answer: 1, 2, and 3. (1 * 2 * 3 = 6, and 1 + 2 + 3 = 6.)
15/ Question: If a pizza is cut into 8 slices and you eat 3, what percentage of the pizza have you consumed? Answer: You have consumed 37.5% of the pizza. (To calculate the percentage, divide the number of slices you’ve eaten by the total number of slices and multiply by 100: (3 / 8) * 100 = 37.5%.)
16/ Question: Which of the four pictures a, b, c, d, is the correct answer?
Answer: Picture b
17/ Question: If three people check into a hotel room that costs $30, they each contribute $10. Later, the hotel manager realized there was a mistake and the room should have cost $25. The manager gives $5 to the bellboy and asks him to return it to the guests. The bellboy, however, keeps $2 and gives each guest $1. Now, each guest has paid $9 (totaling $27) and the bellboy has $2, which makes $29. What became of the $1 that was missing?
Answer: The missing dollar riddle is a trick question. The $27 that the guests paid includes the $25 for the room and the $2 that the bellboy kept.
18/ Question: A man is pushing his car along a road when he comes to a hotel. He shouts, “I’m bankrupt!” Why? Answer: He’s playing a game of Monopoly.
19/ Question: If a man buys a shirt for $20 and sells it for $25, is this a 25% profit?
Answer: No. (The cost price of the shirt is $20, and the selling price is $25. The profit is $25 – $20 = $5. To calculate the profit percentage, you divide the profit by the cost price and then multiply by 100: (5 / 20) * 100 = 25%. The profit percentage is 25%, not the profit amount.)
20/ Question: If a car’s speed increases from 30 mph to 60 mph, how much does the speed increase in terms of a percentage? Answer: The speed increases by 100%.
21/ Question: If you have a rectangular garden that is 4 feet long and 5 feet wide, what is the perimeter? Answer: The perimeter is 18 feet. (The formula for the perimeter of a rectangle is P = 2 * (length + width). In this case, P = 2 * (4 + 5) = 2 * 9 = 18 feet.)
22/ Question: If two hours ago, it was as long after one o’clock as it was before one o’clock, what time is it now? Answer: It’s 2 o’clock.
In the world of logic puzzles, every twist and turn unveils a new challenge for our minds to conquer. To elevate your puzzle experience and add an interactive touch, check out AhaSlide’s features . With AhaSlides, you can turn these puzzles into shared adventures, sparking friendly competitions and lively discussions. Ready to dive in? Visit our templates and bring an extra layer of fun to your logic puzzle journey!
What is an example of a logic puzzle?
Example of a Logic Puzzle: If two hours ago, it was as long after one o’clock as it was before one o’clock, what time is it now? Answer: It’s 2 o’clock.
Where can I find logic puzzles?
You can find logic puzzles in books, puzzle magazines, online puzzle websites, mobile apps, and AhaSlides dedicated to puzzles and brain teasers.
What is a logic puzzle meaning?
A logic puzzle is a type of game or activity that challenges your reasoning and problem-solving skills. It involves using logical deductions to analyze given information and arrive at a correct solution.
Ref: Parade | Buzzfeed
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So go grab a pencil and a piece of scratch paper and prepare to rip your hair out (and we really do mean that in the best way possible). When you think you’ve got the right answer, click the link at the bottom of each riddle to find the solution. Got it wrong? No worries, you have 19 other riddles to test out.
Navigate Through Our Riddles:
Puzzmo / The King’s Orders / How Many Eggs? / The Gold Chain / Pickleball / Circuit Breaker / Two Trains, Two Grandmas / Ant Math / Peppermint Patty / Great American Rail Trail / A Cruel SAT Problem / Movie Stars Cross a River / Tribute to a Math Genius / One Belt, One Earth / Elbow Tapping / Whiskey Problem / Doodle Problem / Stumping Scientists / What ’ s On Her Forehead? / Keanu for President / Who Opened the Lockers?
Riddle No. 1: The King’s Orders Make for One Hell of a Brain Teaser
Difficulty: easy.
King Nupe of the kingdom Catan dotes on his two daughters so much that he decides the kingdom would be better off with more girls than boys, and he makes the following decree: All child-bearing couples must continue to bear children until they have a daughter!
But to avoid overpopulation, he makes an additional decree: All child-bearing couples will stop having children once they have a daughter! His subjects immediately begin following his orders.
After many years, what’s the expected ratio of girls to boys in Catan?
The likelihood of each baby born being a girl is, of course, 50 percent.
Ready for the solution? Click here to see if you’re right .
Riddle No. 2: How Many Eggs Does This Hen Lay?
This problem is in honor of my dad, Harold Feiveson. It’s due to him that I love math puzzles, and this is one of the first problems (of many) that he gave me when I was growing up.
A hen and a half lays an egg and a half in a day and a half. How many eggs does one hen lay in one day?
Riddle No. 3: The Gold Chain Math Problem Is Deceptively Simple
Difficulty: moderate.
You’re rummaging around your great grandmother’s attic when you find five short chains each made of four gold links. It occurs to you that if you combined them all into one big loop of 20 links, you’d have an incredible necklace. So you bring it into a jeweler, who tells you the cost of making the necklace will be $10 for each gold link that she has to break and then reseal.
How much will it cost?
Riddle No. 4: Try to Solve This Pickleball Puzzle
Difficulty: 🚨hard🚨.
Kenny, Abby, and Ned got together for a round-robin pickleball tournament, where, as usual, the winner stays on after each game to play the person who sat out that game. At the end of their pickleball afternoon, Abby is exhausted, having played the last seven straight games. Kenny, who is less winded, tallies up the games played:
Kenny played eight games
Abby played 12 games
Ned played 14 games
Who won the fourth game against whom?
How many total games were played?
Riddle No. 5: Our Circuit Breaker Riddle Is Pure Evil. Sorry.
The circuit breaker box in your new house is in an inconvenient corner of your basement. To your chagrin, you discover none of the 100 circuit breakers is labeled, and you face the daunting prospect of matching each circuit breaker to its respective light. (Suppose each circuit breaker maps to only one light.)
To start with, you switch all 100 lights in the house to “on,” and then you head down to your basement to begin the onerous mapping process. On every trip to your basement, you can switch any number of circuit breakers on or off. You can then roam the hallways of your house to discover which lights are on and which are off.
What is the minimum number of trips you need to make to the basement to map every circuit breaker to every light?
The solution does not involve either switching on or off the light switches in your house or feeling how hot the lightbulbs are. You might want to try solving for the case of 10 unlabeled circuit breakers first.
Riddle No. 6: Two Trains. Two Grandmas. Can You Solve This Tricky Math Riddle?
Jesse’s two grandmothers want to see him every weekend, but they live on opposite sides of town. As a compromise, he tells them that every Sunday, he’ll head to the subway station nearest to his apartment at a random time of the day and will hop on the next train that arrives.
If it happens to be the train traveling north, he’ll visit his Grandma Erica uptown, and if it happens to be the train traveling south, he’ll visit his Grandma Cara downtown. Both of his grandmothers are okay with this plan, since they know both the northbound and southbound trains run every 20 minutes.
But after a few months of doing this, Grandma Cara complains that she sees him only one out of five Sundays. Jesse promises he’s indeed heading to the station at a random time each day. How can this be?
The trains always arrive at their scheduled times.
Riddle No. 7: Here’s a Really F@*#ing Hard Math Problem About Ants
Max and Rose are ant siblings. They love to race each other, but always tie, since they actually crawl at the exact same speed. So they decide to create a race where one of them (hopefully) will win.
For this race, each of them will start at the bottom corner of a cuboid, and then crawl as fast as they can to reach a crumb at the opposite corner. The measurements of their cuboids are as pictured:
If they both take the shortest possible route to reach their crumb, who will reach their crumb first? (Don’t forget they’re ants, so of course they can climb anywhere on the edges or surface of the cuboid.)
Remember: Think outside the box.
Riddle No. 8: This Peppermint Patty Riddle Is Practically Impossible
You’re facing your friend, Caryn, in a “candy-off,” which works as follows: There’s a pile of 100 caramels and one peppermint patty. You and Caryn will go back and forth taking at least one and no more than five caramels from the candy pile in each turn. The person who removes the last caramel will also get the peppermint patty. And you love peppermint patties.
Suppose Caryn lets you decide who goes first. Who should you choose in order to make sure you win the peppermint patty?
First, solve for a pile of 10 caramels.
Riddle No. 9: Can You Solve the Great American Rail-Trail Riddle?
This problem was suggested by the physicist P. Jeffrey Ungar.
Finally, the Great American Rail-Trail across the whole country is complete! Go ahead, pat yourself on the back—you’ve just installed the longest handrail in the history of the world, with 4,000 miles from beginning to end. But just after the opening ceremony, your assistant reminds you that the metal you used for the handrail expands slightly in summer, so that its length will increase by one inch in total.
“Ha!” you say, “One inch in a 4,000 mile handrail? That’s nothing!” But … are you right?
Let’s suppose when the handrail expands, it buckles upward at its weakest point, which is in the center. How much higher will pedestrians in the middle of the country have to reach in summer to grab the handrail? That is, in the figure below, what is h ? (For the purposes of this question, ignore the curvature of the Earth and assume the trail is a straight line.)
Pythagoras is a fascinating historical figure.
Riddle No. 10: This Riddle Is Like an Especially Cruel SAT Problem. Can You Find the Answer?
Amanda lives with her teenage son, Matt, in the countryside—a car ride away from Matt’s school. Every afternoon, Amanda leaves the house at the same time, drives to the school at a constant speed, picks Matt up exactly when his chess club ends at 5 p.m., and then they immediately return home together at the same constant speed. But one day, Matt isn’t feeling well, so he leaves chess practice early and starts to head home on his portable scooter.
After Matt has been scooting for an hour, Amanda comes across him in her car (on her usual route to pick him up), and they return together, arriving home 40 minutes earlier than they usually do. How much chess practice did Matt miss?
Consider the case where Amanda meets Matt exactly as she’s leaving their house.
Riddle No. 11: Can You Get These 3 Movie Stars Across the River?
Three movie stars, Chloe, Lexa, and Jon, are filming a movie in the Amazon. They’re very famous and very high-maintenance, so their agents are always with them. One day, after filming a scene deep in the rainforest, the three actors and their agents decide to head back to home base by foot. Suddenly, they come to a large river.
On the riverbank, they find a small rowboat, but it’s only big enough to hold two of them at one time. The catch? None of the agents are comfortable leaving their movie star with any other agents if they’re not there as well. They don’t trust that the other agents won’t try to poach their star.
For example, Chloe’s agent is okay if Chloe and Lexa are alone in the boat or on one of the riverbanks, but definitely not okay if Lexa’s agent is also with them. So how can they all get across the river?
There isn’t just one way to solve this problem.
Riddle No. 12: This Ludicrously Hard Riddle Is Our Tribute to a Late Math Genius. Can You Figure It Out?
On April 11, John Horton Conway , a brilliant mathematician who had an intense and playful love of puzzles and games, died of complications from COVID-19. Conway is the inventor of one of my favorite legendary problems (not for the faint of heart) and, famously, the Game of Life . I created this problem in his honor.
Carol was creating a family tree, but had trouble tracking down her mother’s birthdate. The only clue she found was a letter written from her grandfather to her grandmother on the day her mother was born. Unfortunately, some of the characters were smudged out, represented here with a “___” . (The length of the line does not reflect the number of smudged characters.)
“Dear Virginia,
Little did I know when I headed to work this Monday morning, that by evening we would have a beautiful baby girl. And on our wedding anniversary, no less! It makes me think back to that incredible weekend day, J___ 27th, 19___ , when we first shared our vow to create a family together, and, well, here we are! Happy eighth anniversary, my love.
Love, Edwin”
The question: When was Carol’s mother born?
This problem is inspired by Conway’s Doomsday Rule .
Riddle No. 13: To Solve This Twisty Math Riddle, You Just Need One Belt and One Earth
Imagine you have a very long belt. Well, extremely long, really … in fact, it’s just long enough that it can wrap snugly around the circumference of our entire planet. (For the sake of simplicity, let’s suppose Earth is perfectly round, with no mountains, oceans, or other barriers in the way of the belt.)
Naturally, you’re very proud of your belt. But then your brother, Peter, shows up—and to your disgruntlement, he produces a belt that’s just a bit longer than yours. He brags his belt is longer by exactly his height: 6 feet.
If Peter were also to wrap his belt around the circumference of Earth, how far above the surface could he suspend the belt if he pulled it tautly and uniformly?
Earth’s circumference is about 25,000 miles, or 130 million feet … but you don’t need to know that to solve this problem.
Riddle No. 14: This Elbow Tapping Riddle Is Diabolical. Good Luck Solving It.
In some future time, when the shelter-in-place bans are lifted, a married couple, Florian and Julia, head over to a bar to celebrate their newfound freedom.
They find four other couples there who had the same idea.
Eager for social contact, every person in the five couples enthusiastically taps elbows (the new handshake) with each person they haven’t yet met .
It actually turns out many of the people had known each other prior, so when Julia asks everyone how many elbows they each tapped, she remarkably gets nine different answers!
The question: How many elbows did Florian tap?
What nine answers did Julia hear?
Riddle No. 15: You’ll Need a Drink After Trying to Solve This Whisky Riddle
Alan and Claire live by the old Scottish saying, “Never have whisky without water, nor water without whisky!” So one day, when Alan has in front of him a glass of whisky, and Claire has in front of her a same-sized glass of water, Alan takes a spoonful of his whisky and puts it in Claire’s water. Claire stirs her whisky-tinted water, and then puts a spoonful of this mixture back into Alan’s whisky to make sure they have exactly the same amount to drink.
So: Is there more water in Alan’s whisky, or more whisky in Claire’s water? And does it matter how well Claire stirred?
The size of the spoon does not matter.
Riddle No. 16: The Doodle Problem Is a Lot Harder Than It Looks. Can You Solve It?
This week’s riddle is relatively simple—but sinister all the same.
The question: Can you make 100 by interspersing any number of pluses and minuses within the string of digits 9 8 7 6 5 4 3 2 1? You can’t change the order of the digits! So what’s the least number of pluses and minuses needed to make 100?
For instance, 98 - 7 - 6 + 54 - 32 shows one way of interspersing pluses and minuses, but since it equals 107, it’s not a solution.
I call this a “doodle problem”: one that’s best worked on during meetings where you might be doodling otherwise.
You might want to start looking for solutions that use a total of seven pluses and minuses (although there are ways to use fewer).
Ready for the solution? Click here to see if you’re right.
Riddle No. 17: This Math Puzzle Stumped Every Scientist but One. Think You Can Crack It?
Difficulty: hard.
In honor of Freeman Dyson, the renowned physicist who died last month , here’s a legendary tale demonstrating his quick wit and incredible brain power.
One day, in a gathering of top scientists, one of them wondered out loud whether there exists an integer that you could exactly double by moving its last digit to its front. For instance, 265 would satisfy this if 526 were its exact double—which it isn’t.
After apparently just five seconds , Dyson responded, “Of course there is, but the smallest such number has 18 digits.”
This left some of the smartest scientists in the world puzzling over how he could have figured this out so quickly.
So given Dyson’s hint, what is the smallest such number?
My second grader has recently learned how to add a 3-digit number to itself using the classic vertical method:
18-digit numbers, of course, can be added in the same way.
Riddle No. 18: Figure Out What’s on Her Forehead
Cecilia loves testing the logic of her very logical friends Jaya, Julian, and Levi, so she announces:
“I’ll write a positive number on each of your foreheads. None of the numbers are the same, and two of the numbers add up to the third.”
She scribbles the numbers on their heads, then turns to Jaya and asks her what her number is. Jaya sees Julian has 20 on his forehead, and Levi has 30 on his. She thinks for a moment and then says, “I don’t know what my number is.” Julian pipes in, “I also don’t know my number,” and then Levi exclaims, “Me neither!” Cecilia gleefully says, “I’ve finally stumped you guys!”
“Not so fast!” Jaya says. “Now I know my number!”
What is Jaya’s number?
Jaya could be one of two numbers, but only one of those numbers would lead to Julian and Levi both not knowing their numbers. Why?
Riddle No. 19: Can You Get Keanu Reeves Elected As President?
It’s 2024, and there are five candidates running in the democratic primary: Taylor Swift, Oprah Winfrey, Mark Cuban, Keanu Reeves, and Dwayne Johnson. (Hey, it could happen.) As usual, the first primary is in Iowa.
In an effort to overcome its embarrassment after the 2020 caucus debacle , the Iowa Democratic Party has just announced a new, foolproof way of finding the best candidate: there will be four consecutive elections.
First, candidate 1 will run against candidate 2. Next, the winner of that will run against candidate 3, then that winner will run against candidate 4, and finally the winner of that election will run against the final candidate. By the transitive property, the winner of this last election must be the best candidate ... so says the Iowa Democratic Party.
Candidate Keanu has been feeling pretty low, as he knows he is ranked near the bottom by most voters, and at the top by none. In fact, he knows the Iowa population is divided into five equal groups, and that their preferences are as follows:
Keanu is childhood friends with Bill S. Preston, Esq., the new head of the Iowa Democratic Party. Preston, confident that the order of the candidates doesn’t matter for the outcome, tells Keanu he can choose the voting order of the candidates.
So what order should Keanu choose?
How would Keanu fare in one-to-one races against each candidate?
Riddle No. 20: Who Opened All These Damn Lockers?
There are 100 lockers that line the main hallway of Chelm High School. Every night, the school principal makes sure all the lockers are closed so that there will be an orderly start to the next day. One day, 100 mischievous students decide that they will play a prank.
The students all meet before school starts and line up. The first student then walks down the hallway, and opens every locker. The next student follows by closing every other locker (starting at the second locker). Student 3 then goes to every third locker (starting with the third) and opens it if it’s closed, and closes it if it’s open. Student 4 follows by opening every fourth locker if it’s closed and closing it if it’s open. This goes on and on until Student 100 finally goes to the hundredth locker. When the principal arrives later in the morning, which lockers does she find open?
Make sure you pay attention to all of the factors.
Laura Feiveson is an economist for the government, a storyteller, and a lifelong enthusiast of math puzzles. She lives in Washington, DC with her husband and two daughters.
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Stay mentally fit with these daily brain exercises. You will learn how to flex your mind, improve your creativity and boost your memory. Try to do some Mentalrobics every single day!
All of our unique online games are free to play and several of them are multiplayer games where you can challenge other members of the Braingle gaming community.
We have an active community of smart people who participate in all areas of the website. Chat with your friends, post comments, and earn points to climb the ladders .
Braingle at a Glance
Riddles, puzzles, logic problems and other enigmas to entangle the mind.
A deceptive or misleading picture that is caused by the disagreement of the eye and the mind.
Need a bigger challenge? Try one of our exciting puzzle experiences!
Learn about encryption, cryptography, codes and ciphers.
An encyclopedia of all types of written, spoken and mechanical puzzles.
Take fun and interesting quizzes on a wide range of topics.
Discover interesting facts and take random quizzes on a variety of topics.
We will show you a picture with only a small piece revealed. Can you identify the object in the photo?
Can you identify the artist who made each of these artistic masterpieces?
Try to identify the famous people in these obscured photos.
Daily exercises and tips for improving memory, creativity, vocabulary and stress management.
The average person's short-term memory can hold 7 things. How much can you remember?
When you are trying to memorize something, flash cards can be a very effective way to improve your memory.
This vocabulary test is loaded with over 3000 of the most common words found on the SAT and GRE standardized tests.
Learn more about how intelligence is measured and calculate your own personal score.
Play popular puzzle games like Sudoku or Wordsearch right in your web browser.
Free strategy games to play online. Compare your score to other Brainglers.
Over 20 logic puzzles in one downloadable book. Can you solve them all?
Learn how to play hundreds of fun card games with our encyclopedia of card game rules.
Dozens of simple games to play with a friend when you only have a pencil and paper.
An active message board with hundreds of topics in which to participate.
Talk with your friends in your own private forum.
Send private messages to your friends.
IM with your favorite Braingle people in this live chat room.
Play some social games with your Braingle friends.
There's always something new to solve!
As a Braingle user you can submit riddles, rate puzzles, make quizzes, keep track of brain teasers and play some of our exclusive games. With our active community frequently adding new brain teaser and quizzes your brain will never get bored!
Join the 200,000+ members who keep their wits sharp with Braingle!
Braingle has a large vibrant community of smart people who contribute to the site in many ways. Some of the coolest features are only available to registered users. It's free to sign up, so why not give it a try?
Create a Free Account!
After creating your account, become a subscriber to get a number of added benefits.
Follow Braingle!
Get Your Free Braingle Account
- Submit your own brain teasers
- Vote on puzzles and track your favorites
- Chat with other smart people
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