If eleven plus two equals one, what does nine plus five equal?

What has a bottom at the top?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

People make me, save me, change me, raise me. What am I?

Why is 6 afraid of 7?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?