SOLUTION: if sum of age of father and son at present is 60 years what will be their age aftet 15 years?

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Question 830267: if sum of age of father and son at present is 60 years what will be their age aftet 15 years?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.F%2BS=60
15 years from now,
%28F%2B15%29%2B%28S%2B15%29=F%2BS%2B30
Then from eq. 1,
%28F%2B15%29%2B%28S%2B15%29=60%2B30
%28F%2B15%29%2B%28S%2B15%29=highlight%2890%29