Name a key which is hardest to turn.

If a wheel has 54 spokes, how many spaces are there between the spokes?

I add 5 to 9 and get 2. The answer is correct, so what am I?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

What number when divided in half becomes zero?

Which part of London exists in France as well ?

Intelligence Agency need to break the vault but the problem is that they are not able to break the vault.

On the vault, a text is written as:

31 11 33 33 43 45
21 25
31 24 11 31 51 41

To Break the code Intelligence Agency brings a mathematician named Joseph.
Minutes later he deciphers the code.

Whats the code?

A very interesting trivia question for all.

Why do men's shirts have their buttons on the right side and women's have buttons on the left-hand side?

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

I am an odd number. Take away a letter and I become even. What number am I?