1) The ratio 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 : A) 5 : 2 B) 2:1 C) 11:7 D) 13:9 Answer: Option BExplanation:let the present ages of the father and son be 7x and 3x years respectively then $7x\times3x\times=756$$=>21x^{2}=756$$=>x^{2}=36$$=>x=6$ Required ratio = $(7x+6):(3x+6) = 48:24 =2:1$
