How many triangles can you find in this given picture?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

What does below chemistry rebus means?

Which number should replace the question mark?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

Find out the missing number in the picture attached:

Can you solve the maths in the below-given picture equation?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

There is something which is always coming but never arrives?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?