What does this Rebus Picture means ?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

Replace the question mark with the number below given a simple math problem.

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?

I look at you, you look at me I raise my right, you raise your left. What am I?

No matter how little or how much you use me, you change me every month. What am I?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

What do you see in the given picture?

What brings you down but never up?