



 
Hi Jerri, I drew a sketch of the pool and stone (not to scale). The pool is 15 feet by 30 feet and the stone region is 4 feet wide all the way around so the external dimension of the pool and stone are $15 + 4 + 4 = 23$ feet by $30 + 4 + 4 = 38$ feet. You can find the volume you want by first finding the volume of a rectangular region which is 23 feet by 38 feet by 4 inches and then removing the volume of a region that is 15 feet by 30 feet by 4 inches. Both of these volumes you can calculate by using our volume calculator. Write back if you need more assistance,  


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