
Matt H. answered 10/09/14
Tutor
5.0
(335)
What are these letters doing in my equations? Here comes algebra!
"single unknown" means using the same variable to describe all 3 people.
Call Rose's age the variable "r".
If Raul is half that age, he is 1/2r.
If Allan is 6 years older than Raul, he is 1/2r + 6.
That's it!