Question

The length of a rectangle is 3 times its width. What is the length of the rectangle if the area is 48 square centimeters?

A. 4
B. 9
C. 12
D. 16

Answer 1

Let l be the length of the rectangle, and w be the width of the rectangle.

l = 3w, so (3w)(w) = 3w^2 = 48

w^2 = 16

w = 4, so l = 12

The length of the rectangle is 12 cm, and the width of the rectangle is 4 cm.

The correct answer is C.