The length of a rectangular floor is more than its breadth by 200%. If Rs.400 is required to paint the floor at the rate of Rs.3/sq m, what would be the length of the floor?	Select.
A) 12  B) 18  C) 20  D) 22  E) 24
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 = 400/3 = 133.33 sq m   l b = 133.33 i.e., l * l/3 = 133.33   l^2 = 400&gt; l = 20.   20
<result>C</result>
The length of a rectangular floor is more than its breadth by 200%. If Rs.400 is required to paint the floor at the rate of Rs.3/sq m, what would be the length of the floor?