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When filled, party balloons generally have a diameter of 10 to 12 inches. The volume of each size is as follows:

10 inch balloon = 523 cubic inches (rounded to the nearest whole number)
12 inch balloon = 904 cubic inches (rounded to the nearest whole number) 523 cubic inches = 0.30 cubic feet (rounded to the nearest hundredth)
904 cubic inches = 0.52 cubic feet (rounded to the nearest hundredth) Therefore, a 9 cubic foot tank would fill between 17 and 30 balloons of this size.

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