1."Dad says he's twice as old as Mum was when he was as old as she is now," declared Mike. "D'you think that's right?" Judy smiled. "Of course. Thirty years ago he was three times as old as Mum was." What do make of those ages?

Dad 54 years, Mum 46

Dad 48 years, Mum 36

Dad 60 years, Mum 40