A teacher asked a boy this question: 'suppose your mother baked a pie and there were seven of you-your parents and five children. What part of the pie would you get"? "A sixth,? replied the boy. "I'm afraid you don't know your fractions,? said the teacher. 'remember, there are seven of you.? "Yes, teacher,? said the boy, "but you don't know my mother. Mother would say she didn't want any pie. '