Marty has a fence in the shape of a rectangle. It's area is 635.4 square feet. the width of the yard is 18 feet. what is the length of the yard?

Divide the area by the width (or the number that the problem gave you). So 635.4/18. This will give you the length because of the formula

length x width = area (formula for the area of a rectangle). So in this case the answer should be 35.3

If you want to check your work just multiply the width by the length. 35.3x18 = 635.4