SOLUTION: John is 40 years older than his son. Ten years later, their combined ages will be 90 years. How old is John?

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Question 394039: John is 40 years older than his son. Ten years later, their combined ages will be 90 years. How old is John?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
s = age of son
s+40 = age of Jon
==>(s+10) + (s+40 + 10) = 90
==>2s + 60 = 90
==> 2s =30
==> s = 15, the age of the son, and
s + 40 = 55, the age of John.