Question

You have a rectangular koi pond that measures 6ft by 8ft. You have enough concrete to cover 72 ft for a walkway that will surround the pond. What should the width of the walkway be?

Answer 1

The width of the walkway should be 1.5 feet.

Answer 2

Do to this you need to use the rectangular prism formula:
L * w * h

You need to switch it all around to get to:
6 * 8 = 48,

Now you have the area of the cross side, you can divide the volume (72) by the cross area:

72 / 48 = 1.5,
So the width would be 1.5ft.

Hope this helps.