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 from the following options
A) 12 cm
B) 15 cm
C) 18 cm
D) 21 cm
E) 24 cm

Rationale: 2 l + 2 w = 5 w l = 3 w / 2 w * l = 150 3 w ^ 2 / 2 = 150 w ^ 2 = 100 w = 10 l = 3 ( 10 ) / 2 = 15 the answer is b .
Answer: B