Answer:
The dimensions should be 66 ft by 54 ft
Step-by-step explanation:
Let L represent the length of the rectangular lot.
Let W represent the width of the rectangular lot.
The formula for determining the perimeter of a rectangle is expressed as
Perimeter = 2(L + W)
They can afford 240 feet of fencing. This means that
2(L + W) = 240
Dividing through by 2, it becomes
L + W = 120 - - - - - - - - - - - -1
They decide to make the length 12 feet longer than the width.. This means that
L = W + 12
Substituting L = W + 12 into equation 1, it becomes
W + 12 + W = 120
2W + 12 = 120
2W = 120 - 12
2W = 108
W = 108/2
W = 54 feet
L = W + 12 = 54 + 12
L = 66 feet
