The age of a man is equal the sum of ages of his 3 sons at present. What was the ratio of his age & his eldest son's age 3 year before. Given that the difference of age of his sons is 3 & age of father is 48 at present.
According to given condition
f = a+b+c
f = c-6+c-3+c (c is the age of eldest son)
f = 3c - 9
f/3 = c-3
So ratio
(f-3)/(c-3) = (f-3)/(f/3)
45/16
Option 4)