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A 20 Gallon tank can hold up to 20 gallons of water.

Q: How many gallons of water does a 20 gallon tank hold?

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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).

how many gallons of water will a tank that is 5 foot by 4 foot by 8 foot hold

21.1 gallons

This is an 80 gallon tank.

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A gallon

80 quarts. A gallon equals 4 quarts.

If you have a gallon, you only can have one gallon.

1 gallon

Roughly 1 gallon for every 18 inches of hose.

Five. If you have a FIVE GALLON jug, it'll hold five(5).

26 Gallons

20 gallons

16 gallons

7.48 gallons

Most water tanks will be labled by size. That means how many gallons the tank hold is what it is called. A 100 gallon tank will be sold as such and a ten gallon tank will be labled that way. So just check the labels. Most water tanks hold about thirty gallons of water. Of course the bigger the tank the more water it will hold. And you can purchase apartment sized water tanks that will hold a lot less then the average water tank.

A three-inch diameter pipe one foot long holds 0.367 gallon.