Geneva wants to put fencing around her rectangular flower bed. The width of her flower bed is the length. The perimeter of the flower bed is 20 feet.
What are the dimensions of her flower bed?
A. length = 7 feet; width = 3 feet
B. length = 6 feet; width = 4 feet
C. length = 3 feet; width = 7 feet
D. length = 4 feet; width = 6 feet