SOLUTION: age of son is one-third of the age of father,5 years ago the son was 10 years old,the present age of father is?

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Question 687612: age of son is one-third of the age of father,5 years ago the son was 10 years old,the present age of father is?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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let f = father's present age
let s = son's
:
Write an equation for each statement:
:
age of son is one-third of the age of father,
s = 1%2F3f
or
f = 3s
:
5 years ago the son was 10 years old,
s - 5 = 10
s = 15 yrs now
:
the present age of father is?
f = 3(15)
f = 45 yrs now