SOLUTION: A man is 25 years older than his son and they have 31 years between them. How old is the son?

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Question 762507: A man is 25 years older than his son and they have 31 years between them. How old is the son?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +m+ = man's age
Let +s+ = Son's age
(1) +m+=+s+%2B+25+
(2) +m+%2B+s+=+31+
-----------------
Substitute (1) into (2)
(2) +s+%2B+25+%2B+s+=+31+
(2) +2s+%2B+25+=+31+
(2) +2s+=+6+
(2) +s+=+3+
The son is 3
----------
check:
(1) +m+=+s+%2B+25+
(1) +m+=+3+%2B+25+
(1) +m+=+28+
and
(2) +m+%2B+s+=+31+
(2) +m+%2B+3+=+31+
(2) +m+=+31+-+3+
(2) +m+=+28+
OK