How many paying stones, each measuring 2 1/2 m * 2 m are required to pave a rectangular court yard 60 m long and 16 1/2 m board? Choose the correct answer.
A) 99	B) 18	C) 16	D) 198	E) 15

Rationale: "60 * 33 / 2 = 5 / 2 * 2 * x = > x = 198 answer : d"
Answer: D