The ratio between the perimeter and the width of a rectangle is 5 : 1. If the area of the rectangle is 294 sq. cm, what is the length of the rectangle? Choose the correct answer:
A) 15 cm B) 18 cm C) 21 cm D) 24 cm E) 27 cm
2L+2W = 5W   L = 3W/2   W*L = 294   3W^2/2 = 294   W^2 = 196   W = 14   L = 3(14)/2 = 21   The answer is 21 cm.
<result>C</result>
The ratio between the perimeter and the width of a rectangle is 5 : 1. If the area of the rectangle is 294 sq. cm, what is the length of the rectangle?