Question 157619: A MAN IS THREE TIMES AS OLD HIS SON. fOUR YEARS AGO HE WAS FOUR TIMES AS OLD HIS SON WAS AT THE TIME. HOW OLD IS THE SON. Found 2 solutions by unajan, Fombitz:Answer by unajan(1) (Show Source):
You can put this solution on YOUR website! Let the man be M years old, his son S years old.
1.
Four years ago, the man was (M-4) and his son (S-4).
2.
We can expand and simplify eq. 2,
2.
2.
Substitute eq. 1 into eq. 2 and solve for S.
2.
From 1,
The man is 36 years old and his son 12 years old (3x12=36).
Four years ago, the man was 32 and his son 8 (4x8=32).
The answers check out.
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