Good Riddles

Question: A hill full a hole full you cannot catch a bowl full.

Question: There are 30 cows in a field and 28 chickens....how many didn't?

Question: You wait for it. It cracks, stays for a moment, and then vanishes before your eyes. What is it?

Question: If 1/2 of 5 is 3, then what is 1/3 of 10?

Question: John has been hired to paint the numbers 1 through 100 on 100 apartments.

How many times with he have to paint 8?