Brain Teasers

The very best brain teasers of the internet.

Three sons

One day, a father went to his three sons and told them that he would die soon and he needed to decide which one of them to give his property to. He decided to give them all a test. He said, "Go to the market, my sons, and purchase something that is large enough to fill my bedroom, but small enough to fit in your pocket." From this, I will decide who of you is the wisest and is worthy enough to inherit my land." So, they all went to the market and bought something that they thought would fill the room, yet was still small enough that they could fit into their pockets. Each son came back with a different item. The father told his sons to come into his bedroom one at a time and try to fill up his bedroom with whatever they had purchased. The first son came in and put some pieces of cloth that he had bought and laid them end to end across the room, but it barely covered any of the floor. Then the second son came in and laid some hay, that he had purchased, on the floor but there was only enough to cover half of the floor. The third son came in and showed his father what he had purchased and how it could fill the entire room yet still fit into his pocket. The father replied, "You are truly the wisest of all and you shall receive my property." What was it that the son had showed to his father?

Answer
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Average: 9.1 (7 votes)
Kind of riddle

A teacher writes six words on a board

A teacher writes six words on a board: “cat dog has max dim tag.” She gives three students, Albert, Bernard and Cheryl each a piece of paper with one letter from one of the words. Then she asks, “Albert, do you know the word?” Albert immediately replies yes. She asks, “Bernard, do you know the word?” He thinks for a moment and replies yes. Then she asks Cheryl the same question. She thinks and then replies yes. What is the word?

Answer
Tags
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Average: 7.2 (6 votes)

Smarter than you

Some will use me, while others will not, some have remembered, while others have forgot. For profit or gain, I'm used expertly, I can't be picked off the ground or tossed into the sea. Only gained from patience and time, can you unravel my rhyme? What am I?

Answer
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Average: 9 (1 vote)
Kind of riddle

There are three crates

There are three crates, one with apples, one with oranges, and one with both apples and oranges mixed. Each crate is closed and labeled with one of three labels: Apples, Oranges, or Apples and Oranges. The label maker broke and labeled all of the crates incorrectly. How could you pick just one fruit from one crate to figure out what’s in each crate?

Answer
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Average: 9 (1 vote)

Three men are lined up behind each other

Three men are lined up behind each other. The tallest man is in the back and can see the heads of the two in front of him; the middle man can see the one man in front of him; the man in front can’t see anyone. They are blindfolded and hats are placed on their heads, picked from three black hats and two white hats. The extra two hats are hidden and the blindfolds removed. The tallest man is asked if he knows what color hat he’s wearing; he doesn’t. The middle man is asked if he knows; he doesn’t. But the man in front, who can’t see anyone, says he knows. How does he know, and what color hat is he wearing?

Answer
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Average: 7.6 (5 votes)

Cars

Three cars had driven into a parking lot at the same time, and the three drivers left them all for the attendant to park. Unfortunately, he isn't too good at remembering exactly which driver drove which car. However, he is sure of these 6 facts:

a. Colin drove the BMW if and only if Mr. Cooper drove the Avenger.
b. Alan drove the Cortina if and only if Mr. Cooper drove the BMW.
c. Colin is Mr. Brown if and only if Mr. Andrews drove the BMW.
d. Brian is Mr. Andrews if and only if Colin drove the BMW.
e. Mr. Cooper drove the Avenger if and only if Alan is Mr. Brown.
f. Colin is Mr. Brown if and only if Alan drove the Cortina.

Who arrived with which car?

Answer
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Average: 8 (1 vote)
Kind of riddle

Three fruit boxes

Picture three boxes containing fruit. The first box is marked peaches, the second is marked oranges, and the third box is marked peaches and oranges. Each of the boxes is labeled incorrectly. How could you label each box correctly if you were allowed to select only one fruit from one of the boxes?

Answer
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Average: 8 (1 vote)
Kind of riddle

What day

Alice is walking throught the forest of forgetfulness. She wants to know what day of the week it is. She stops and asks a lion and a unicorn. Now the lion lies all of the time on Monday, Tuesday, and Wednesday. The unicorn always lies on Thursday, Friday and Saturday. Alice asks the lion what day it is, he says, "Well, yesterday was one of my lying days." Alice can't figure it out just from the lion's answer so she asks the unicorn and the unicorn says, "Yesterday was also one of my lying days." What day is it?

Answer
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Average: 8 (1 vote)
Kind of riddle

Lunch money

John noticed that the amount he was paying for his lunch was a rearrangement of the digits of the amount of money he had in his pocket, and that the money he had left over was yet another rearrangement of the same three digits! How much money did John start with?

Answer
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Average: 8 (1 vote)
Kind of riddle

Knight moves

I have a calculator that can display ten digits. How many different ten-digit numbers can I type using just the 0-9 keys once each, and moving from one keypress to the next using the knight’s move in chess? (In chess, the knight move in an L-shape – one square up and two across, two squares down and one across, two squares up and one across, and other like combinations)

Answer
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Average: 8 (1 vote)
Kind of riddle