The length of a rectangular garden is 5 feet longer than its width. The garden is surrounded by a 2-foot-wide sidewalk. The sidewalk has an area of 76 square feet. Find the dimensions of the garden.

he width is 5 feet and the length 10 feet

Let the width of the garden = W

Therefore the length = W + 5

The two sidewalks alongside the length are therefore W + 5 feet long by 2 feet wide = 2 (W + 5) square feet each

The 2 sidewalks alongside the width = W feet long by 2 feet wide = 2W square feet each

In addition there are the 4 corners which are each 2 feet by 2 feet = 4 square feet each

Area of sidewalk is therefore

2 * lengths = 2 * 2 (W + 5) = 4W + 20

2 * widths = 2 * 2W = 4W

4 corners = 4 * 4 = 16 square feet

But we are told that the area = 76 square feet

Therefore 4W + 20 + 4W + 16 = 76

8W + 36 = 76

8W = 40

W = 5

Therefore as the width is five feet the length is 5 + 5 = 10 feet