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How many gallons of water does a rectangle hold measuring 56 inches by 18 inches?
Wiki User
∙ 13y ago
20"x16"x12"=3840 cubic inches. 1 gal of water has a volume of 231 cubic inches therefore the nominal/quoted/rated volume of water the tank will hold is 3840 divided by 231 which is just over 16.6 gallons of water. The tank will never hold that amount of water when keeping fish. At least 1 inch will be left empty at the top and if the tank is set up with plants lights etc an average of 2 inches will be taken up with gravel at the bottom. So 3 inches is a quarter of 12 (which is the depth of the tank) that is reducing the holding capacity of the tank by one quarter so 16.6 divided by 4 will give how much less water the tank will actually hold. That amount is 4.15 gallons. So the tank will actually hold 16.60 minus 4.15 gallons. Which leaves you with 12.45 gallons if it is a planted tank. Applying the basic rule of fishkeeping "1" of fish needs a minimum of 1 gallon of water, you will see that your tank can house a maximum of 12.5 inches of fish.
Wiki User
∙ 14y ago
Wiki User
∙ 13y ago6,048 cubic feet (28 x 18 x 12 = 6,048) equates to about 45,242.2 US gallons of water.
Wiki User
∙ 14y agothis doesnt make sense. an inch is a unit of length, a gallon is a unit of volume.
Wiki User
∙ 13y agoA rectangle is a flat shape and can't hold any water. Unless you fold it up into a box, in which case it might. But then it depends how you fold up the rectangle.
Wiki User
∙ 15y agowhat is the answer to my question plaese?
Wiki User
∙ 10y ago18.7 US gallons
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