Question

The difference between Sheila and Robbie's ages is 12. The sum of their ages is 42. If Sheila is the younger of the two, how old is Robbie?

Answer 1

Start with the facts you have been given and see if you can go from there, like I showed you with the other question.

S = Sheila and R = Robbie

S + R = 42, and
R - S = 12

Good luck. Let me know how it goes.