How many paying stones, each measuring 3 * 2 m are required to pave a rectangular court yard 15 m long and 6 m board? Choose the correct choice:
A) 99  B) 18  C) 26  D) 15  E) 12
15 * 6 = 3 * 2 * x =&gt; x   = 15   Answer: 15
<result>D</result>
How many paying stones, each measuring 3 * 2 m are required to pave a rectangular court yard 15 m long and 6 m board?