Two whole numbers whose sum is 72 cannot be in the ratio :
A
5 : 7
B
3 : 5
C
3 : 4
D
4 : 5
Correct Answer: 3 : 4
A. 5 : 7 5x + 7x = 72 12x = 72 x = 6 B. 3 : 5 3x + 5x = 72 x = 9 C. 3 : 4 3x + 4x = 72 x = 72/7 D. 4:5 4x + 5x = 72 x = 8