The length of the rectangular field is double its width. Inside the field there is square shaped pond 9m long. If the area of the pond is 1/8 of the area of the field. What is the length of the field? Choose one:
A) 54  B) 36  C) 75  D) 28  E) 11

Rationale: "a / 8 = 9 * 9 = > a = 9 * 9 * 8 x * 2 x = 9 * 9 * 8 x = 18 = > 2 x = 36 answer : b"
Answer: B