son's present age: x
father's present age : y
4 yrs from now:
son : x+4
father : y+4
y+4 = 3(x+4)
y = 3x + 8
6 yrs ago:
son : x-6
y - 6 = 7(x-6)
y = 7x -36
so 7x -36 =3x+8
4x = 44
x = 11
y = 3(11)+8 = 41
The son is now 11 and the father is now 41
4 yrs from now: son-- 15, father 45
3 times as old? yes
6 yrs ago: son -- 5, father 35
7 times as old? yes
all is good
Thank you very much Reiny!
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