填空题 A census-taker calls at a house. He asks the woman living there the ages of her three daughters. The woman says, "If you multiply their ages the total is 72 ; if you add their ages the total is the same as the number on my front door, which you can see. "
The census-taker says, "That is not enough information for me to calculate their ages. "
The woman says, "Well, my eldest daughter has a cat with a wooden leg. "
The census-taker replies, "Ah! Now I can calculate their ages. " What are the ages of the
three girls?