Math

If 3 cats can kill 3 rats in 3 minutes, how long will it take 100 cats to kill 100 rats?

related riddles

If half of 5 were 3, what would one-third of 10 be?

Why does 10+10=11+11

An apple is 40 cents, a banana is 60 cents and a grapefruit is 80 cents. How much is a pear?