Logic Riddles

 
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Question: There's a place in the world where the wind blows south then suddenly north.

Where is it?

Answer: The South Pole. Until it reaches the pole it is going south, then as it passes the pole it is going north.

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In the sink (medium)

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By Acacia

Question: Why is the man standing in the sink?

Answer: Because he is a tap dancer.

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By Ro Lander

Question: Your friend is OCD and has to have things in a particular way. She even labels her socks so that the sock for the left foot will always be worn on the left foot and vice versa. Why did she lace her left shoe with a brown lace and the right one with a green lace?

Answer: So that she will always know which shoe each lace is for. Since the left shoe is currently laced with a brown lace and the right one with a green lace, she knows that the other brown lace is for the right shoe and the other green lace is for the left. The question tells you that she is very particular about which foot things go on but says nothing about colour.

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Question: An apple tree has apples on it. A storm comes through and there is no longer apples on the tree. But there isn't apples on the ground either.

How can this be so?

Answer: The tree had two apples so when one fell in the storm the tree and ground both had just one apple. So neither had apples just an apple.

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Question: Three gods A, B, and C are called, in no particular order, True, False, and Random. True always speaks truly, False always speaks falsely, but whether Random speaks truly or falsely is a completely random matter. Your task is to determine the identities of A, B, and C by asking three yes-no questions; each question must be put to exactly one god. The gods understand English, but will answer all questions in their own language, in which the words for yes and no are da and ja, in some order. You do not know which word means which.

What three questions can you ask?

Answer: A possible solution is:

Q1: Ask god B, "If I asked you 'Is A Random?', would you say ja?". If B answers ja, either B is Random (and is answering randomly), or B is not Random and the answer indicates that A is indeed Random. Either way, C is not Random. If B answers da, either B is Random (and is answering randomly), or B is not Random and the answer indicates that A is not Random. Either way, you know the identity of a god who is not Random.

Q2: Go to the god who was identified as not being Random by the previous question (either A or C), and ask him: "If I asked you 'Are you False?', would you say ja?". Since he is not Random, an answer of da indicates that he is True and an answer of ja indicates that he is False.

Q3: Ask the same god the question: "If I asked you 'Is B Random?', would you say ja?". If the answer is ja, B is Random; if the answer is da, the god you have not yet spoken to is Random. The remaining god can be identified by elimination.

For more information about the answer visit the following Wikipedia page.

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