Which number should replace the question mark?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

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

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

What do you call a fish without an eye?

Spot the cat in the picture below

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

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

There are three boxes on a table. One of the box contains Gold and the other two are empty. A printed message contains in each box. One of the message is true and the other two are lies.

The first box says "The Gold is not here".

The Second box says "The Gold is not here".

The Third box says "The Gold is in the Second box".

Which box has the Gold?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.