How many paying stones, each measuring 2 1/2 m * 2 m are required to pave a rectangular court yard 70 m long and 16 1/2 m board?
Choose the correct choice from the following answers:	A) 99	B) 18	C) 16	D) 10	E) 231
70 * 33/2 = 5/2 * 2 * x =&gt; x   = 231   Answer:231
<result>E</result>
How many paying stones, each measuring 2 1/2 m * 2 m are required to pave a rectangular court yard 70 m long and 16 1/2 m board?