SOLUTION: The sum of the ages of Isaac and Autumn is 113 years. 9 years ago Isaac was 4 times autumn’s age. How old is Isaac now?

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Question 1165627: The sum of the ages of Isaac and Autumn is 113 years. 9 years ago Isaac was 4 times autumn’s age. How old is Isaac now?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
system%28y%2Bx=113%2Cy-9=4%28x-9%29%29


x for Autumn
y for Isaac

x=113-y
Substitute that:
y-9=4%28%28113-y%29-9%29
y-9=4%28104-y%29
y-9=416-4y
5y-9=416
5y=425
y=425%2F5
highlight%28y=85%29

This could be solved in other ways.
(Recheck the answer to be sure.)