1. "You and your wife, and a boy," Charlie commented. "But he's not your son?" "No, Betty's brother Ted," Dave replied. "That was taken a year ago, when Ted was half as old as Betty, and I was one and a half times as old as she was. It's odd that our three ages now total the square of our son's age." How old was the son?

Son was aged 9 years

Son was aged 8 years

Son was aged 7 years