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?
Select:	A) 99	B) 88	C) 77	D) 665	E) 41
30 * 33/2 = 5/2 * 2 * x =&gt; x = 99   99nswer:99
<result>A</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?