If you say my name, I will no longer exist. What am I?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

A car meter reading shows 72927 miles a palindromic number.
what is the minimum number of miles you would need to travel to see another palindromic number on the car meter reading?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

A man was convicted of a minor offence in Akbar court. Akbar decided to give him a chance. He asked him to give a statement. If the statement is true, he will be killed by lions and if it is false, he will be killed by trampling of wild elephants.

The convicted person requested help from Birbal and since the crime was not a big one, Birbal decided to help him. Whatever Birbal suggested impressed Kabir and he let the convicted person go.

What did Birbal suggest to the person?

What's a single-digit number with no value?

What does it mean?

Why do people go to bed?

Can you start the fire using two pieces of wood?

Can you place six X (crosses) in below board without making three in a row in any way ?