Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

Can you find out the remainder when 3^300 is divided by 5?

A man dies of old age on his 25 birthday. How is this possible?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

The dirtier I get, the whiter I look. Who am I?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

How can a man go eight days without sleep?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.