The width of a rectangle is 10mtr and its area is 150 square meter. If length of the rectangle is increased, then its new area is 1(1/3) times of the original area. What is the new perimeter of the rectangle?  Pick one.
A) 45	B) 54	C) 67	D) 60	E) 69
Ans.(D)   Sol. Length of original rectangle = 150/10= 
<gadget id="calculator">150/10</gadget>
<output>15</output>
15   (10*(15+x))/(10*15)= 4/3   x = 5   Perimeter of new rectangle = 2(10+20) = 60
<result>D</result>
The width of a rectangle is 10mtr and its area is 150 square meter. If length of the rectangle is increased, then its new area is 1(1/3) times of the original area. What is the new perimeter of the rectangle?