Two-third of a positive number and 64/216 of its reciprocal are equal. The number is:
Choose the correct choice
A) 5 / 12  B) 12 / 5  C) 25 / 144  D) 2 / 3  E) 146 / 25

Rationale: "let the number be x . then , 2 / 3 x = 64 / 216 * 1 / x x 2 = 64 / 216 * 3 / 2 = 64 / 144 = 4 / 9 x = 2 / 3 answer : d"
Answer: D