1. "I just noticed a funny coincidence about the ages of our respective parents," said Nathan. Imogen put down her book. "I suppose you mean Dad's one year older than Mum, and there's also one year between your parents." "That's only part of it," her husband replied. "If you write your mother's age before your father's, you get the product of my parents' ages." How old were his parents?

Nathan's parents 78 and 79 years old

Nathan's parents 82 and 83 years old

Nathan's parents 75 and 76 years old