Logic Puzzles

The Latest and exclusive collection of Logic Puzzles to tease your brain. Logic Puzzles helps exercising the brain and develop it to think logical and solve real world problems differenlty. PuzzleFry brings you the best Logic Puzzles, you'll enjoy wide range of Logic Puzzles, Lets try few Logic Puzzles listed below -
  • There are three Federation Officers assigned to take three hostile aliens to “Peace Talks” on another planet. However, they must follow the following rules:

    They have only one small space ship.
    Only two individuals can ride in the space ship each time.
    All Federation Officers can pilot the space ship, but only one alien can pilot the ship.
    If at any time there are both Federation Officers and aliens on a planet, then there must always be more (or the same number of) Federation Officers than aliens on that planet. This is because if there are more aliens than Federation Officers, then the aliens will kill the Federation Officers. Count any individual in the space ship when it is on one planet as being on that planet.
    The one space ship is the only means of transportation. There is no other way to get to the “Peace Talks”. No one can exit the space ship while it is in flight.
    To start off, all the Federation Officers and aliens are on the same planet.

    Can all Federation Officers and aliens get to the other planet alive, and if so: how?

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  • You have five pieces of chain, each consisting of three links. You want to make one long chain of these five pieces. Breaking open a link costs 1 $, and welding an open link costs 3 $.

    Is it possible to make one long chain of the five pieces, if you have just 15 $?

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  • Jenny has boxes in three sizes: large, standard, and small. She puts 11 large boxes on a table. She leaves some of these boxes empty, and in all the other boxes, she puts 8 standard boxes. She leaves some of these standard boxes empty, and in all the other standard boxes, she puts 8 (empty) small boxes. Now, 102 of all the boxes on the table are empty.

    The question: How many boxes has Jenny used in total?

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  • You are given “n” coins of denominations 1, 0.5, 0.25, 0.1, 0.05 and 0.01 (6n coins altogether). You are then asked to choose n out of these 6n coins that sum up to exactly 1. What is the smallest n for which this is impossible?

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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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  • Assume that you have a number of long fuses, of which you only know that they burn for exactly one hour after you lighted them at one end. However, you do not know whether they burn with constant speed, so the first half of the fuse can be burnt in only ten minutes while the rest takes the other fifty minutes to burn completely. Also, assume that you have a lighter.

    How can you measure exactly three quarters of an hour with these fuses?

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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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  • 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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