1. Peter put down his pencil. "Grandpa is just twice as old as you, isn't he, Dad?" he asked. "That's right," Steve replied. "What of it?" "Well, I've noticed something funny about your ages," the boy told him. "If you add four to the first figure of your age, and take away four from your last figure, you get his age." Well?

40 and 80

38 and 76

36 and 72