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by R.K » Wed May 30, 2012 10:06 am
A fathers age is 30 times older than his son however after 18 years he will only be thrice as old as son find the present age of father?
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by Jim@StratusPrep » Wed May 30, 2012 10:23 am
Equation 1 --> F = 30S
Equation 2 (remember to add 18 to both) --> F + 18 = 3(S +18)

Normally, I would set up the problem and solve for F, but this example it is a bit easier the other way despite the extra step.

Substituting:

30S + 18 = 3S + 54
-3S - 18 -3S - 18

27S = 36
S = 1 1/3

F = 30 (1 1/3) = 40
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