The width of a rectangular hall is ½ of its length. If the area of the hall is 450 sq.m, what is the difference between its length and breadth?	Select.
A) 8m
B) 10m
C) 12m
D) 15m
E) 17m
Let the length of the hall be x m   Breadth of the hall = 1x/2 m   Area of the hall = Length * Breadth   450 = x * 1x/2   x² = 900   x =30   15mifference between the length and breadth of the hall = x - 1x/2 = x/2   =30/2= 
<gadget id="calculator">30/2</gadget>
<output>15</output>
15m   ANSWER:15m
<result>D</result>
The width of a rectangular hall is ½ of its length. If the area of the hall is 450 sq.m, what is the difference between its length and breadth?