How many paying stones, each measuring 2 1/2 m * 2 m are required to pave a rectangular court yard 60 m long and 16 1/2 m board? Pick one:
A) 99
B) 18
C) 16
D) 198
E) 15
60 * 33/2 = 5/2 * 2 * x =&gt; x   = 198   Answer:198
<result>D</result>
How many paying stones, each measuring 2 1/2 m * 2 m are required to pave a rectangular court yard 60 m long and 16 1/2 m board?