<PRE><B>Question 884736</B>
a father is three times the age of his son.after 12 years his age will be two times the age of his son. solve this in 2 variable
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let x=age of son
let y=age of father
y=3x
..
After 12 yrs:
y+12=age of father
x+12=age of son
..
y+12=2(x+12)
y+12=2x+24
sub 3x for y
3x+12=2x+24
x=12
y=3x=36
..
age of son=12
age of father36</PRE>