So,
For plan A, we got that:
If all the fence is 480 ft, then, we know that the length of all the three gardens is:
Where if we solve for y, we got that:
Now, remember that the area of a rectangle is given by multiplying its width and large. The width of the rectangle formed by the three gardens is "x" and its large is "3y". We know that y = 80 - 2/3x, so:
So that's an expression for the combined area of the three gardens in plan a.
For plan b, we're given that:
The length of the combined gardens is given by:
Wher