Can you find out the missing number in the grid?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

What is the riddle which can be asked all day with a different correct answer each time.

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

What Does this text mean:

important=important

What country can make you shiver?

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?