SOLUTION: Nine years ago, I was one more than eleven times as old as my son Mike. Now, I am seven more than three times as old as him. How old was my son 9 years ago?

Question 983425: Nine years ago, I was one more than eleven times as old as my son Mike. Now, I am seven more than three times as old as him. How old was my son 9 years ago?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Nine years ago, I was one more than eleven times as old as my son Mike. Now, I am seven more than three times as old as him. How old was my son 9 years ago?
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F = father's age 9 yrs ago
S = son's age 9 yrs ago
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F = 11S + 1
F + 9 = 3(S + 9) + 7 --> F = 3S + 25
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11S + 1 = 3S + 25
8S = 24
S = 3 was son's age 9 yrs ago

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