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? Choose the correct choice from the following:
A) 99
B) 18
C) 26
D) 17
E) 12
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?