How many gallons of water are in a fish tank that is 20 x 99?

You can't calculate the gallons of water in a fish tank with just the dimensions 20 x 99. You need the height of the tank as well.

Here's why:

* Volume: The amount of water a tank holds (its volume) is calculated by multiplying length x width x height.

* Units: You need consistent units. If the dimensions are in inches, you'll get cubic inches. If they're in feet, you'll get cubic feet. You'll then need to convert those cubic units to gallons.

To calculate the gallons, you'll need to do the following:

1. Get the height of the tank.

2. Make sure all dimensions are in the same units.

3. Calculate the volume: Length x Width x Height.

4. Convert the volume to gallons: There are approximately 231 cubic inches in one gallon, or 7.48 gallons in one cubic foot.

Example:

Let's say your tank is 20 inches long, 99 inches wide, and 12 inches high.

1. Volume: 20 inches x 99 inches x 12 inches = 23,760 cubic inches

2. Gallons: 23,760 cubic inches / 231 cubic inches/gallon = 102.86 gallons