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?
Pick one.
A) 41	B) 23	C) 56	D) 99	E) 87
Explanation:   30 * 33/2 = 5/2 * 2 * x =&gt; x = 99   Answer: 99
<result>D</result>
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?