14-07-09 The teacher said: If the shepherd put twenty sheep out to feed on the grass in a field, five of them jumped a fence, how many sheep would be left? None, called out little Mac. The teacher said: I am surprised that you can't count correctly. I know t...

12-05-15 Bill is a good student and an intelligent boy. He likes to study arithmetic, and he can do all of the arithmetic problems in his book easily. One day on his way to school Bill passed a fruit store. There was a sign in the window which said, Apple-Si...