SOLUTION: The total age of a woman and her son is 51 years. Three years ago, the woman was eight times as old as her son. How old is her son now?

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Question 809249: The total age of a woman and her son is 51 years. Three years ago, the woman was eight times as old as her son. How old is her son now?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
w+s=51,
w=51-s
w-3=8(s-3)
w-3=8s-24
w=8s-21
8s-21=51-s
9s=72
s=8
w=43