Question 766996
A father is four times older than his son. However,20 years later, he will only be twice as old as the son.What is the father's present age?
------------
Now:
F = 5S
In 20 years:
F+20 = 2(S+20)
sub for F
5S + 20 = 2S + 40
3S = 20
S = 20/3
F = 100/3 years
====================
PS  "4 times older" is not the same as "4 times as old"