Our product and our sum always give the same answer. Who are we?

Why Wine Glass Stem is so long?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

who is silent in the parliament?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

If 21x = 79x, what is the value of x?

A man had five children. He had $100 with him to give to his children. He decided to start with the youngest child and then give $2 more than each younger child to his next elder child.

For example, if he gives $x to the youngest child, he will give $(x+2) to the next one, $[(x+2) + 2] to the next one and so on.

Can you find out how much did the youngest one receive?

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