If x is 2/5 of y and y is 5/7 of z, what is the ratio of z : x?
A
5 : 7
B
2 : 7
C
7 : 5
D
7 : 2
Correct Answer: 7 : 2
According to the question, X = 2Y/5 & Y = 5Z/7 = > X = 2/5 x 5Z/7 = > X = 2Z/7 = >Z/X = 7/2 = 7:2 Answer: 7:2