How many paying stones, each measuring 2 1/2 m * 2 m are required to pave a rectangular court yard 30 m long and 16 1/2 m board?  Choose the correct choice from the following: A) 90 B) 99 C) 97 D) 95 E) 65

Rationale: "30 * 33 / 2 = 5 / 2 * 2 * x = > x = 99 answer b"
Answer: B