3
Q:

Logical puzzle 

Additional Details

At a restaurant, how could you choose one out of three desserts with equal probability with the help of a coin? What if the coin is biased and the bias is unknown?

 

Answer:
Q:

Logical puzzle

You have 10 coins….arrange them in 4 straight lines such that each line contains 4 coins.

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Subject: Logic Puzzles

7 380
Q:

Logical puzzle

You want to send a secret message to your friend Alex in the mail. But Sam, who you don't trust, has access to all your mail. So you put your message in a box with a lock. But you are not allowed to send a key! How can you get your message through securely?

Answer

- Send the box with the lock to Alex. 


- Alex can't open it, but can put another lock on the box. 


- Alex sends this box with the 2 locks back to you, you unlock your lock and send it back to Alex again.


- So there is just Alex's lock on the box and Alex can now open it.

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Subject: Logic Puzzles

3 387
Q:

Logical puzzle

There are only two barbers in town. One of them has a nice, neatly trimmed head of hair. The other one's hair is a complete mess.Which of the two barbers should you go to and why?

Answer

The one with messy hair, as they cut the neat barber's hair.

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Subject: Logic Puzzles

3 516
Q:

Logical puzzle

You work at a fruit factory.
There are 3 crates in front of you. One crate contains only apples. One crate contains only oranges. The other crate contains both apples and oranges. And each crate is labeled. One reads "apples", one reads "oranges", and one reads "apples and oranges". But the labeling machine has gone crazy and is now labeling all boxes incorrectly. If you can only take out and look at just one of the pieces of fruit from just one of the crates, how can you label ALL of the crates correctly?

Answer

Our solution:


Take a piece of fruit from the "apples and oranges" crate. If it's an apple then you know that is the "apples" crate since ALL THE CRATES ARE LABELED INCORRECTLY. This means the crate marked "apples" must be "oranges" and the crate marked "oranges" must be "apples and oranges".

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Subject: Logic Puzzles

16 1356
Q:

Logical puzzle

 A boy and a girl are talking.
"I am a boy" - said the child with black hair.
"I am a girl"  - said the child with white hair.

At least one of them lied. Who is the boy and who is the girl?

Answer

Our Solution:


They both lied.
The child with the black hair is the girl, and the child with the white hair is the boy.
(If only one lied they would both be boys or both be girls)

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Subject: Logic Puzzles

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