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

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

Why is a river so rich ?

Count the squares in the matchstick puzzle below?

Look at the picture and find out which square is not linked with any of the other squares.

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

The more you take me, the more you leave me behind.
Who Am I?

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.

Count the number of balls in picture below:

Solve below popular number sequence
314 159 265 358 979 323 846 ?