The width of Julie's garden is 8 feet and the area of her garden is 160 square feet.
Step-by-step explanation:
We know that the garden is rectangular, so it has two equal lengths and two equal widths. We also know that Julie placed 56 feet of fencing around her garden, so the perimeter of the garden is:
P = 2L + 2W = 56
We are given that the length is 20 feet, so we can substitute that in and solve for W:
2(20) + 2W = 56
40 + 2W = 56
2W = 16
W = 8
So the width of the garden is 8 feet.
To find the area of the garden, we can use the formula:
A = L x W
Substituting the known values, we get:
A = 20 x 8
A = 160
Therefore, the area of Julie's garden is 160 square feet.