Question 695864: A father is 20yrs older than his son. If the sum of their ages is 40yrs, how old is the son now?
Answer by ReadingBoosters(3246)   (Show Source):
You can put this solution on YOUR website! f = s + 20
f + s = 40
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Substitute the first equation into the second
s+20 + s = 40
Combine like terms
2s + 20 = 40
2s = 40 - 20
2s = 20
s = 10
f = s + 20 = 10 + 20 = 30
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Father is 30, Son is 10
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