Question

The length of a rectangle is three times the width. The area of the rectangle is 108 sq in. What is the width of the rectangle?
6 in.
9 in.
12 in.
36 in.

Answer 1

Let the width be w. Then the length is 3w, and the area is w·3w = 3w^2 = 108.

So w^2 = 108/3 = 36, hence w = 6 in.

Answer: 6 in.