



 
Hi Marie. To make things simple, we can think of the tanks attached endtoend so there is just one tank that is 75 feet deep and it has a radius of 15 feet. The volume of such a cylinder is the area of the circle times the depth. If you find the area of the circular end (A = pi x radius^{2} ) and multiply by the depth, you will have the number of cubic feet of water that the tank holds. Then if you multiply by the conversion factor 7.5 gallons / cubic foot, you get the number of gallons of water. Hope this helps,  


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