The length of a rectangular floor is more than its breadth by 200%. If Rs. 624 is required to paint the floor at the rate of Rs. 4 per sq m, then what would be the length of the floor? Select:
A) 22.8m.  B) 21.6m.  C) 21.1m.  D) 20.6m.  E) 22.5m.
Let the length and the breadth of the floor be l m and b m respectively.   l = b + 200% of b = l + 2b = 3b   Area of the floor = 624/4= 
<gadget id="calculator">624/4</gadget>
<output>156</output>
156 sq m   l b= 156 i.e., l * l/3 = 156   l2 = 468 =&gt; l = 21.6m.   ANSWER:21.6m.
<result>B</result>
The length of a rectangular floor is more than its breadth by 200%. If Rs. 624 is required to paint the floor at the rate of Rs. 4 per sq m, then what would be the length of the floor?