SOLUTION: if a father is 20 years older than his son. What is the sum of their ages seven years ago?

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Question 993332: if a father is 20 years older than his son. What is the sum of their ages seven years ago?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
if a father is 20 years older than his son. What is the sum of their ages seven years ago?
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I don't know.