1. When Bob was as old as Rob was when Bob was half as old as Rob was when Bob was as old as Rob is, Rob was just a third as old as Bob was when Rob was half as old as Bob is. Rob, who is younger, is in his ’teens, and we have of course taken ages in complete years. So how old are they?

Rob 16 years old, Bob 22

Rob 19 years old, Bob 24

Rob 18 years old, Bob 20