Can you replace the question mark with the correct number?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

Can you guess the name of the month by looking the below rebus ?

10+10 and 11+11 can give you the same answer.

Explain how?

Be active and find the killer in the picture Riddle below.

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

The more of this there is, the less you see. What is it?