Add 9 + 1. Then mulitply 9 x 1. Do you get the same answer each time?
Answer:
No. 9 + 1 = 10 and 9 x 1 = 9.
Try another Brain Teaser:
A woman walks into a restaurant and asks the manager for a glass of water. The manager aims a gun at her, the woman was pleased, said thank you and left. Why?