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

What does this Rebus Picture means ?

I can turn polar bears white.
I can make anyone dance.
I can make everyone cry
I can make your hands clap
I can make you thin.
I can make you smile.
I can make you smile

Can you guess the riddle?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Find the next number in the sequence

5 12 24 36 ?

What has a ring but no finger?

There is a place where if I stand up straight, I will still be considered sideways.