Replace the question mark with the correct number in below Picture:

If 2 workers can complete painting 2 walls in exactly 2 hours.

How many workers would be needed to paint 18 walls in 6 hours?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

What is the next shape from answers A, B, C, and D figure?

There is something which you can be arrested for attempting but not for successfully completing.

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

Two old friends, Jack and Jill, meet after a long time, and discussing as:

Jack: Hey, how are you, man?

Bill: Not bad, got married and I have three kids now.

Jack: That's awesome. How old are they?

Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.

Jack: Cool..But I still don't know.

Bill: My eldest kid just started taking piano lessons.

Jack: Oh, now I get it.

How old are Bill's kids?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

What's a single-digit number with no value?

If it took eight men ten hours to build a wall, how long would it take four men to build it?