Task: Question Answering
Input (English): Problem: if 5 x = 3 y and xy ≠ 0, what is the ratio of 1 / 5 * x to 1 / 6 * y ?
Options: a. 25 / 6, b. 36 / 25, c. 18 / 25, d. 5 / 6, e. 25 / 36
Output (English): c