The ratio between the perimeter and the width of a rectangle is 5 : 1. If the area of the rectangle is 150 sq. cm, what is the length of the rectangle?
Choose the correct choice:
A) 12 cm B) 15 cm C) 18 cm D) 21 cm E) 24 cm
2L+2W = 5W   L = 3W/2   W*L = 150   3W^2/2 = 150   W^2 = 100   W = 10   L = 3(10)/2 = 15   The answer is 15 cm.
<result>B</result>
The ratio between the perimeter and the width of a rectangle is 5 : 1. If the area of the rectangle is 150 sq. cm, what is the length of the rectangle?