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?
500 gallons.
781.987 gallons.
92 gallons
You can fit 8 gallons in 8 gallons.
840 half-gallons.
7.5 gallons
There are precisely 107026920 gallons in 107026920 gallons!
There are 144 gallons in 576 gallons.
There are 3 gallons
7.91888967 imperial gallons = 9.51019 US gallons.
300 gallons
25,000 Gallons