How is the moon similar to a dollar?

There was a strange boy who was born before his father. How can this be possible?

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?

81 x 9 = 801. What must you do to make the this equation true?

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 ?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

How many sides does a circle have?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

The more you take me, the more you leave me behind.
Who Am I?

I have Rs.50 and I spend it in the way as below.