7 carpet-weavers can weave 7 carpets in 7 days. At the same rate, how many carpets would be woven by 14 carpet-weavers in 14 days? Choose the most appropriate option:
A) 14  B) 28  C) 21  D) 35  E) None of these
Explanation :   Solution: Let the required number of carpets be x.   More weavers, more carpets (Direct proportion)   more days, more carpets (Direct proportion)   weavers 7 :14   } : : 7 : x   days 7 : 14   .'. 7*7*x = 14*14*7 &lt;=&gt; x = 14*14*7/7*7 = 28.   Answer : 28
<result>B</result>
7 carpet-weavers can weave 7 carpets in 7 days. At the same rate, how many carpets would be woven by 14 carpet-weavers in 14 days?