Answer:
W = 16 feet
L = 19 feet
Explanation:
We'll assume this is a rectangular garden.
Let L and W be the width and length, respectively.
W*L = Area = 304 ft^2
L = W + 3
Use this last expression in the first:
W*L = 304 ft^2
W*(W+3) = 304 ft^2
W^2+3W = 304 ft^2
W^2+3W - 304 ft^2 = 0
W = 16 and - 19. We'll assume we're in the current galaxy, so we can ignore the - 19 feet.
W = 16 feet
L = 304ft^2/16ft = 19 feet