Select the option that is related to the third number in the same way as the second number is related to the first number. 9 : 72 :: 5 : ?

39 25 20 35

20

9 : 72 :: 5 : ? The logic followed here is: Ist term2 - Ist term = IInd term Given 92 - 9 81 - 9 = 72 Similarly 5 : ? 52 - 5 25 - 5 = 20