what does this picture(rebus) riddle means ?

It belongs to you, but other people use it more than you do. What is it?

I am quite hot but become too cold if you remove the first two letters. What am I?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

Wednesday, Steve and Pam go to a restaurant to eat lunch. After eating lunch, they pay the bill. But Steve and Pam do not pay the bill. So…who does?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

What is full of holes but still holds water?

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?