A.  5 : 2

B.  7 : 3

C.  9 : 2

D.  13 : 4

1
Correct Answer :
7 : 3
Explanation :

Let the ages of father and son 10 years ago be 3x and x years respectively

Then, (3x+10) + 10 = 2 [(x+10) + 10]

=> 3x + 20 = 2x +40

=> x = 20

=> Required ratio = (3x+10 : (x+10)

=> 70 : 30 = 7 : 3


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