SOLUTION: a father is now four times as old as his son. five years ago he was seven times as old as his son. how old are tehy now?

Algebra ->  Customizable Word Problem Solvers  -> Age -> SOLUTION: a father is now four times as old as his son. five years ago he was seven times as old as his son. how old are tehy now?       Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 612871: a father is now four times as old as his son. five years ago he was seven times as old as his son. how old are tehy now?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
a father is now four times as old as his son. five years ago he was seven times as old as his son. how old are they now?
-----------------------
Equations:
f = 4s
f-5 = 7(s-5)
----
Substitute for "f" and solve for "s":
4s - 5 = 7s - 35
3s = 30
s = 10 (Son's age now)
----
solve for "f";
f = 4s
f = 40 (Father's age now)
==============================
Cheers,
Stan H.
==============================