Not A Matter Of Arithmetic

"I hear you 're very good at arithmetic, Bobby, ' ' said the visitor pleasantly. "Sure," returned Bobby, without looking up from his play. ' ' Well, if I should tell you when your papa and your mamma were born, could you tell me how oíd they are?" asked the visitor. "I could tell you how oíd pap is," answered the boy. "And not how old your mother is?" The boy shook his head. "Arithmetic hasn't to do with that, " he