There are about 67.3 US gallons in that volume.
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The answer depends on the units used for the question. Are they 12 inches * 12 inches * 30 inches or are they feet, or metres or miles?
Volume = pi*272*54/12 cubic feet = 19,274 US gallons, approx.
24 inches x 12 inches x 9 inches = 1.5 cubic feet = 11.2 US gallons, approx.
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Convert everything to feet, then use the formula for the volume of a cylinder. Since the answer will be in cubic feet, you'll then have to convert it to gallons.