If 5x = 6y and xy ≠ 0, what is the ratio of 1/3*x to 1/5*y ? Choose the correct choice
A) 25 / 6  B) 36 / 25  C) 2  D) 5 / 6  E) 25 / 36

Rationale: 5 x = 6 y = > x / y = 6 / 5 1 / 3 * x to 1 / 5 * y = x / y * 5 / 3 = ( 6 / 5 ) * ( 5 / 3 ) = 2 ans : c
Answer: C