The ratio of age of A and his son is 9:3. If the difference of their ages 6 years ago is 36, then find the sum of the ages of A and his son together 4 years hence.
Let the present age of A and his son be 9x and 3x respectively. => (9x – 6) – (3x – 6) = 36 => x = 6 Required sum = [(9 + 3) × 6] + 8 = 80 years
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