The of the father’s age to his son’s age 7 : 3. The product of their ages are 756. The ratio of their ages after 6 years will be

\par Let the present ages of the father and son be 7x years and 3x years respectively.

7x\times 3x = 756

21x^{2} = 756

x^{2} = 36

x = 6

\par Required ratio = (7x + 6) : (3x + 6) = 48 : 24 = 2 : 1