ANSWER
Length = 12 ft;
Width = 6 ft
Step-by-step explanation
We have that the ratio of the length and width is 6 : 3.
The area of the rectangle is 72 square feet.
The area of a rectangle is given as:
A = L * W
where L = length
W = width
From the ratio, we have that:
L : W = 6 : 3
That is:
Therefore, the area of the rectangle is:
Therefore, the length is:
L = 2 * W
L = 2 * 6
L = 12 ft
Therefore, the dimensions of the rectangle is length of 12 ft and width of 6 ft.