0.566666667
0.622916667
0.708333333
0.755555556
Answer is Wrong!
Answer is Right!
The answer is C. 15 : 120.
In each of the other options, the second number is the product of the first number and the sum of its digits. For example, 96 is the product of 12 and (1 + 2 = 3). Similarly, 117 is the product of 13 and (1 + 3 + 7 = 11). And 128 is the product of 16 and (1 + 2 + 8 = 11).
However, 120 is not the product of 15 and the sum of its digits. The sum of the digits of 15 is 6, and 120 is not a multiple of 6.