Two-third of a positive number and 49/216 of its reciprocal are equal. The number is: Choose the correct choice from the following
A) 5 / 12
B) 7 / 12
C) 25 / 144
D) 144 / 25
E) 146 / 25

Rationale: "let the number be x . then , 2 / 3 x = 49 / 216 * 1 / x x 2 = 49 / 216 * 3 / 2 = 49 / 144 x = 7 / 12 answer : b"
Answer: B