How many paying stones, each measuring 4 m * 2 m are required to pave a rectangular court yard 40 m long and 20 m board?  Options:
A) 99
B) 18
C) 100
D) 17
E) 12
40 * 20 = 4 * 2 * x =&gt; x   = 100   Answer: 100
<result>C</result>
How many paying stones, each measuring 4 m * 2 m are required to pave a rectangular court yard 40 m long and 20 m board?