Good Riddles

Question: Mr. Smith has 4 daughters. Each of his daughters has a brother.

How many children does Mr. Smith have?

Question: A man walks all the way around the world without getting wet.

How does he do this?

Question: What is the longest word in the dictionary?

Question: How many apples grow on a tree?

Question: It smells like blue paint,
pours like green paint,
and it looks like a red truck.

What is it?