Brain Teaser

Get ready for brain teasing exercise with the latest collection of Brain Teasers, Riddles, puzzles and much more. Brain teasers are the puzzles that requires thought to solve with thinking in unconventional ways with given constraints in mind, it also involves lateral thinking, Logic puzzles and riddles which are some specific types of brain teasers. Here at puzzlefry you'll enjoy wide range of Brain Teasers which will tease your Brain and make it extra ordinary, Lets try few listed below -
  • On the right, you see a paper with a chessboard print on it. We want to cut the chessboard paper into pieces (over the lines!) such that each piece has twice as much squares of one color than of the other color (i.e. twice as much black squares as white squares or twice as much white squares as black squares).

    Is it possible to do this? Give a proof!

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  • A road is divided into two ways.  One leads to City of truth and the other leads to City of Lies. All the people belonging to City of Truth always tell truth and all the people belonging to City of Lies  always lie.

    There are two people standing at the division,  one from City of Truth and the other from City of Lies. You don’t know who belongs to which city.
    You can ask only one question to any one of the two people standing there to determine which way leads to the City of Truth and which leads to City of Lies.

    What would be your question..?

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  • On the game of Poker, two people play as follows:
    Player 1 takes any 5 cards of his choice from the deck of 52 cards. Then player 2 does the same out of the remaining 47. Then player 1 may choose to discard any of his cards and replace them from the remaining 42. Then player 2 may discard any of his cards and replace them, but he may not take player 1’s discards. ALL of the transactions with the deck are public knowledge, unlike the real game of Poker.

    After this process, the winner is the one who has the better poker hand. For the benefit of those who have not played poker, these are the highest ranking hands, in decreasing order of value:

    Royal Flush: the A K Q J 10 of the same suit.
    Straight Flush: any five consecutive of one suit. Highest card of the five is the tiebreaker. No one suit is more powerful than another.
    Four of a kind: all four of one rank (i.e. four aces). A hand with 4 aces outranks 4 kings, etc.
    Full house: a pair of one rank and 3-of-a-kind in another rank, i.e. Q Q 8 8 8.
    Flush: Any 5 cards of the same suit that don’t satisfy #2.
    Because of the clear advantage of player 1, the win is given to player 2 if the hands are equal in strength.

    Which player would you rather be? What strategy do you use?

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  • Jacob has three boxes with fruits in his barn: one box with apples, one box with pears, and one box with both apples and pears. The boxes have labels that describe the contents, but none of these labels is on the right box.

    How can Jacob determine what each of the boxes contains, by taking only one piece of fruit from one box?

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  • A light bulb is hanging in a room. Outside of the room, there are three switches, of which only one is connected to the lamp. In the starting situation, all switches are ‘off’ and the bulb is not lit.

    If it is allowed to check in the room only once to see if the bulb is lit or not (this is not visible from the outside), how can you determine with which of the three switches the light bulb can be switched on?

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  • You have two jugs. One jug has a content of 3 litres and the other one has a content of 5 litres.

    How can you get just 4 litres of water using only these two jugs?

    (There is plenty of water available to refill the jugs)

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  • Jacob and John run a 100 meter race. Jacob wins by five yards. To make it sporting, he starts 5 yards behind the original start line in the second race. Assuming both runners run at the same speed, who wins the second race? The challenge is to solve this problem without doing any algebra.

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  • After death of a rich old man, his children are surprised to know that he has left all of his money to his oldest son Jacob, who loved him dearly, and ignored his other children, who hated him.

    So, the funeral is a day or two later, and the other sons and daughters have decided to kill Jacob and take his inheritance. Since his father’s death, Jacob has taken to drinking, and they know that, at the wake, he’s going to be gulping down the liquor like it was nectar of the gods. So they decide to poison the drinks. One of the other sons, John, tends bar, and gets the poison all ready.

    So Jacob comes up, crying and depressed, and orders a scotch on the rocks. John serves him one, and he chugs it down in two seconds. “Give me another.” Jacob gives him a second glass of scotch, which he also drinks in a matter of moments. The other siblings are puzzled…the poison is fast-acting; Jacob should be convulsing on the floor and retching his guts out. Finally, fifteen minutes later, a rather inebriated and very much alive Jimmy orders one last glass of scotch, but as John hands it to him, he changes his mind and leaves, sobbing. The other siblings come over to John, and wonder what’s going on. They talk about what could have gone wrong for a few minutes, and figure the poison’s harmless. So John sips the drink he poured for Jacob, and is pronounced DOA thirty minutes later.

    Why did Jacob live ? (He had no immunity to the poison, he didn’t know it was coming, and the poison was obviously deadly.)

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  • You have to cut a cube into 27 smaller cubes (just like a Rubik’s Cube). It is to be done with 6 cuts to the original cube i.e. 2 in the x, 2 in the y, 2 in the z. Now, assuming that you can arrange the pieces however you like before doing a cut, what is the minimum number of cuts required to obtain the 27 smaller cubes?

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