The ration of the father’s age to his son’s age is 7:3.The product of their ages is 756.The ratio of their ages after 6 years will be :	Choose the correct choice from the following answers:
A) 5:2  B) 2:1  C) 11:7  D) 13:9  E) None of these
Solution   Let the present ages of the father and son be 7x and 3x years respectively.   Then,7x 3x =756 ⇔ 21x2=756 ⇔ x2=36 ⇔ x=6.   ∴ Required ratio =(7x +6) :(3x +6)=48:24=2:1. Answer 2:1
<result>B</result>
The ration of the father’s age to his son’s age is 7:3.The product of their ages is 756.The ratio of their ages after 6 years will be :