A school teacher asked a boy this question about fractions: "Suppose your mother baked an apple pie, and there were seven of you - your parents and five children. What part of the pie would you get?"
"A sixth, Ma'am," the answered.
"But there are seven of you," said the teacher. "Don't you know anything about fractions?
"Yes," replied the boy," I know all about fractions, but I know all about Mother, too. She would say she did not want any pie."