Complete the table series riddle by finding the number that can replace "??".

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

Find the 8 in the below-given Image.

Where do fish keep their money?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

You visit a home for specially-abled children on the occasion of Christmas where you meet with 50 children. You have a box of chocolates containing 50 chocolates exactly.

What if you were asked to one chocolate to each child in a manner that one chocolate still remains in the box? Is it possible?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

What is next number in the pattern below:

131 517 192 123 ?

People put me on the table and cut me but do not eat me. What am I?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?