• # Brain Teasers & Puzzles

Questions Per Page:
• If you walk one mile south, then one mile east and then one mile north, you reach the place where you started. In such a scenario, how many points are there on the globe to make it happen?

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• You’ve got someone working for you for seven days and a gold bar to pay him. The gold bar is segmented into seven connected pieces.

You must give them a piece of gold at the end of every day.

What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

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vipin Scholar
• 38516 views

• You have two jars, 50 red marbles and 50 blue marbles. You need to place all the marbles into the jars such that when you blindly pick one marble out of one jar, you maximize the chances that it will be red. When picking, you’ll first randomly pick a jar, and then randomly pick a marble out of that jar. You can arrange the marbles however you like, but each marble must be in a jar.

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vipin Scholar
• 12363 views

• This is the most commonly asked interview puzzle.

You have 3 jars that are all mislabeled. One jar contains Apple, another contains Oranges and the third jar contains a mixture of both Apple and Oranges.

You are allowed to pick as many fruits as you want from each jar to fix the labels on the jars. What is the minimum number of fruits that you have to pick and from which jars to correctly label them?

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vipin Scholar
• 4504 views

• You are blindfolded and 10 coins are place in front of you on table. You are allowed to touch the coins, but can’t tell which way up they are by feel. You are told that there are 5 coins head up, and 5 coins tails up but not which ones are which. How do you make two piles of coins each with the same number of heads up? You can flip the coins any number of times.

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vipin Scholar
• 2986 views

• You are standing before two doors. One of the path leads to gold room and the other one leads to sack room. There are two guards, one by each door. You know one of them always tells the truth and the other always lies, but you don’t know who is the honest one and who is the liar.

You can only ask one question to one of them in order to find the way to gold room. What is the question?

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vipin Scholar
• 3692 views

• A man has two ropes of varying thickness (Those two ropes are not identical, they aren’t the same density nor the same length nor the same width). Each rope burns in 60 minutes. He actually wants to measure 45 mins. How can he measure 45 mins using only these two ropes.
He can’t cut the one rope in half because the ropes are non-homogeneous and he can’t be sure how long it will burn.

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vipin Scholar
• 3062 views

• Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

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vipin Scholar
• 37509 views

• Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

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vipin Scholar
• 34924 views

• A bunch of men are on an island, A genie comes down and gathers everyone together and places a magical hat on some people’s heads (i e , at least one person has a hat). The hat is magical: it can be seen by other people, but not by the wearer of the hat himself. To remove the hat, those (and only those who have a hat) must dunk themselves underwater at exactly midnight. If there are n people and c hats, how long does it take the men to remove the hats? The men cannot tell each other (in any way) that they have a hat.

Note: Genie does not tell how many hats she has put.

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vipin Scholar
• 4761 views

• ## More puzzles to try-

• ### What am i?

People see through me, but none pass through without killing me. I can be anywhere, and can be seen double ...Read More »
• ### Pick a number!!

What is 2+2? What is 4+4? What is 8+8? What is 16+16? Pick a number between 12 and 5.Read More »
• ### How can this happen?

There were two grandmothers and their two granddaughters. There were two husbands and their two wives. There were two fathers ...Read More »
• ### Summing pairs of numbers to primes

For any even number N, partition the integers from 1 to N into pairs such that the sum of the ...Read More »
• ### How long would it take?

To dye a single Easter egg takes 7.5 minutes if you leave it in dye. How long would it take ...Read More »
• ### The king and two poisons

There is a kingdom and in the kingdom when you drink a poison the only way to cure yourself is ...Read More »
• ### Easy Math missing multiplication puzzle

Can you find the solution to this math missing multiplication puzzleRead More »
• ### Filling of Mugs

Remove 6 liters of oil from a large oil container using only two mugs of 9 liter and 4 liter ...Read More »
• ### Find the right switch

There is a lightbulb (incandescent, it’s currently off) in an upstairs room. You are downstairs, standing next to a panel ...Read More »
• ### Tricky calculation

A man in New York City has \$10. He spends \$6.50 on flowers, and \$3 on lunch (hot coffee and ...Read More »
• ### Weighing piles of coins

There are two kinds of coins, genuine and counterfeit.  A genuine coin weighs X grams and a counterfeit coin weighs ...Read More »
• ### You change me every month riddle

No matter how little or how much you use me, you change me every month. What am I?Read More »
• ### Johnson Brothers tricky riddle

There were three Johnson brothers – – Mark Johnson – Mike Johnson – Peter Johnson One of them threw a ...Read More »
• ### Why not?

A bus driver was heading down a street in Delhi. He went right past a stop sign without stopping, he ...Read More »
• ### To help celebrate the New Year, we’ve decided to give you a New Year’s toast. There’s just one catch….you’ll have to solve the puzzle first!

Answer the clues below to find each word. Then place the letters on the lines below. Each letter must be ...Read More »
• ### Make it Nine Fifty puzzle

Using only one straight line in the below picture, can you turn this into nine fifty?Read More »
• ### Jacob and Magician Riddle

Jacob went with his girlfriend Melony in a magic show. At the start of the show, the magician tells the ...Read More »
• ### What do you say to stay alive?

A man aproaches you in a dark alley. He says, ‘If you tell a lie, I will kill you with ...Read More »
• ### Always with me Riddle

I am with you from birth, I feel your every move, and I feel your every thought. Guess me who ...Read More »
• ### How can you explain this?

Sonal had her birthday in the year 2000 she became 8 years old. But she was born in the year ...Read More »