Robert is twice as old as Charlotte. Five years ago his age was three times Charlotte's age. Find their present ages.
r = robert now = 2 c
5 years ago
(r-5) = 3 (c-5)
Sub in r = 2c
(2c - 5)=(3c-15)
10 = c r = 2c = 20 y/o
+37165 
