By definition the area of a rectangle is: A = w * l The perimeter is: P = 2w + 2l Where, w: width l: long Substituting values: 300 = w * l 80 = 2w + 2l Solving the system of equations we have: l = 30 m w = 10 m Answer: The length and width of the field are: l = 30 m w = 10 m