A landscape architect wants to maximise the area of a herbal garden. The fence around the perimeter of the area must be 60 metres long. The optimal width of the rectangular area is ?

Answer 1

Duplicate post. Already answered.

The answer will be 225 m^2. (15 x 15 m)

Try other length-width combinations, or use "completing the square" and algebra, or calculus to convince yourself.