A 20 Gallon tank can hold up to 20 gallons of water.
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If you have a gallon, you only can have one gallon.
Five. If you have a FIVE GALLON jug, it'll hold five(5).
21.1 gallons
This is an 80 gallon tank.
how many gallons of water will a tank that is 5 foot by 4 foot by 8 foot hold