SOLUTION: Faridah is 3 times as old as her sister. Two years ago, the difference of squares of their ages was 240. What are their present age?

Algebra ->  Customizable Word Problem Solvers  -> Age -> SOLUTION: Faridah is 3 times as old as her sister. Two years ago, the difference of squares of their ages was 240. What are their present age?      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 824053: Faridah is 3 times as old as her sister. Two years ago, the difference of squares of their ages was 240. What are their present age?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
f=3s,
(f-2)^2-(s-2)^2=240
f^2-4f-s^2+4s = 240
f = 18, s = 6