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) 55  E) 22
99nswer: Option 99   Explanation:   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?