He said the height was 24 inches, not 29, so it's less than 90

I missed the part about the bow front. Determining the volume of a bow front is a little bit more complicated than a simple LxWxH. The base width (width at the ends) is used as the W, as are the L and H. That much is all the same. Then you must add the volume of the bow, which can be done the same way, only the W is the widest part of the bow (subtract the width of the end from the total width of the center). Multiply that by H, and then multiply that by 1/2 the length of the tank. That will give you the approximate volume of the bow. Add that to the rectangle and that's the total volume.

Another way you can do it is just to average the widths (add the end and the middle and divide by 2) and use that as your W in the LxWxH=V equation.

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