SOLUTION: a man is 4 times old his son and their ages add up to 40 years. What was the age of son 5 years ago?

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Question 611963: a man is 4 times old his son and their ages add up to 40 years. What was the age of son 5 years ago?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
4x+x=40
5x=40
x=8
x-5=3
The son was 3 years old five years ago