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

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

I have no life, but I can die. What am I?

One night, a man runs away from home. He turns left and keeps running. After some time he turns left again and keeps running. Later, he turns left one more time and runs back home—but when he gets home, he finds a man in a mask. Who was the man in the mask?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

I’m tall when I’m young, and I’m short when I’m old. What am I?

A man dies of old age on his 25 birthday. How is this possible?

What does Alexander the Great and Winnie the Pooh have in common?