The ratio of a to b is 4 to 5, where a and b are positive. If x equals a increased by 75 percent of a, and m equals b decreased by 60 percent of b, what is the value of m/x? Choose the correct answer:
A) 2 / 5
B) 3 / 4
C) 4 / 5
D) 5 / 4
E) 2 / 7

Rationale: "a / b = 4 / 5 m / x = ( 2 / 5 ) * 5 / ( 7 / 4 ) * 4 = 2 / 7 the answer is e ."
Answer: E