How many times can you subtract the number two from the number fifty?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

What is the centre of gravity?

There is an ancient kingdom where every married woman keeps information regarding the fidelity of other men. However, what they don't know is the fidelity of their own husbands. Also, there is an ancient belief that they don't tell each other about the fidelity of their husbands.

On a certain day, the queen of the kingdom declares that she has identified at least one unfaithful man in the kingdom. She allows the wives to identify and gives them authority to kill their husbands if they are unfaithful at midnight.

How will the wives manage it?

How many times do a clock's hands overlap in a day ?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

I have feet, but no legs. Which animal Am I?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?