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54
x-9 = 5(y-9) {x=dads age, y=sons age today)
and today, x=3y
=> y = 18 and hence x =54
—-
x=3y means,
3y-9=5(y-9)
3y-5y=-45+9
-2y=-36
so y=-36/-2
y=18
=> 3s = d
=> 5(s-9) = d
therefore
5s-45=3s
2s = 45
s=22.5
hence
d= 67.5