What can you catch but never throw?

What am I?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

There is a square piece of paper with a hole that is denoted by the circle on the top right side in the given picture. You have to cut the paper in a manner that it forms two and only two separate pieces of paper and then rearrange the pieces in a manner that the holes come in the centre of the paper.

It is always ahead of me yet I can never see it. What is it?

What does this rebus means ?

PROG WORKRESS

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

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?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?