Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

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

How can a man go eight days without sleep?

How is the moon similar to a dollar?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

What month of the year has 28 days?

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

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?