What number should come in place of the question mark below?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Buy me, smell me or deliver me, I do not change.

Who am I?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?