A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Which alphabet letter is a question?

What is black when you buy it, red when you use it, and gray when you throw it away?

What 5-letter word typed in all capital letters can be read the same upside down?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

You can see it everyday, But cannot touch it at will. What is it?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

Rectify the following equality 101 - 102 = 1 by moving just one digit.