If 5x = 3y and xy ≠ 0, what is the ratio of 1/5*x to 1/6*y ? Choose one:
A) 25 / 6
B) 36 / 25
C) 18 / 25
D) 5 / 6
E) 25 / 36

Rationale: "5 x = 3 y = > x / y = 3 / 5 1 / 5 * x to 1 / 6 * y = x / y * 6 / 5 = ( 3 / 5 ) * ( 6 / 5 ) = 18 / 25 ans : c"
Answer: C