SOLUTION: 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.

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!

Answer by Fombitz(32388) (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.
RELATED QUESTIONS
A man is three times as old as his son.Fours years ago he was four times as his son was... (answered by ankor@dixie-net.com)
A man is three times as old as his son. Four years ago, he was four times as old as his... (answered by solver91311)
A man is three times as old as his son. Four years ago he was four times as old as his... (answered by ankor@dixie-net.com)
A man is four times as old as his son. Three years ago, he was 5 times s old as his son... (answered by stanbon)
A man is three times as old as his son. Four years ago,he was four times as old as his... (answered by ultrakimidis1)
Four years ago, Robert was four times as old as his son was at the time. At tye present,... (answered by josgarithmetic)
a man is thrice as old as his son . Three years ago the man was four times as old as his... (answered by jorel1380)
at the present time a man is four times as old as his son six years ago he was 10 times... (answered by Stitch)
a man is three times as old as his son. four years ago, the sum of their ages was 60... (answered by ewatrrr)