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?

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?

Can you spot the hidden girl in the picture below?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

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

why?

Can you move 2 matchsticks to form four equal sized squares.

On a magical land of Mexico , all the animal in the land are rational.

There are 10 tigers and one goat.
Tiger can eat goat but since it's a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).

If we leave them for some time then how many goat and tiger will be there , when we come back ?

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?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?