You can put this solution on YOUR website! A man is three times as old as his son.
m = 3s
Fours years ago he was four times as his son was at that time.
m - 4 = 4(s - 4)
m - 4 = 4s - 16
m = 4s - 16 + 4
m = 4s - 12
How old is the son?
In the above replace m = 3s
3s = 4s - 12
3s - 4s = -12
-s = -12
s = 12 yrs is the son
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See if that checks out in the statement: m = 3(12)
"Fours years ago he was four times as his son was at that time."
36 - 4 = 4(12 - 4)
32 = 4(8)
