Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

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

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

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

which number am I?

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

You have a thousand Re. 1 coins with you. You have ten bags with you and you can put any number of coins in each of the bags. The condition is that if someone asks you for any amount between 1 and 1000, you must be able to give that amount by just giving the bag (you are not allowed to open the bag and give coins).

How will you do it?

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?