Mathematics
posted by Needer .
Eureka is 9 years younger than Rex. In 3 years Rex will be twice as old as Eureka. How old are they now?

e = r9
(r+3) = 2(e+3)
r+3 = 2(r9+3)
r+3 = 2r12
r = 15
Rex is 15
Eureka = 6
in three years, they will be 18 and 9