Two numbers whose sum is 84 can not be in the ratio
5 : 7
13 : 8
1 : 3
3 : 2
Correct Option: D
According to the question, The number 84 must be a multiple of sum of the terms of ratio. For ratio 3 : 2, Sum of the terms of ratio = 3 + 2 = 5 which is not a factor of 84.
