# Finding the Volume of a Fish Tank

I need an equation or equations to help me find out how many pounds of sand I will need to fill my fish tank and so I can determine how much it will cost me.

The tank measures 71 inches in length and 18 inches in width. I want to know how much sand I will need for a 3, 4, 5, and 6 inch base.

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...and

Height of base (H) = 4 inches

Volume of the sand in the fish tank (V) = Length x Width x Height

= 71 x 18 x 4

= 5112 cubic inches

Case 3: 5 inch base of sand

Height of base (H) = 5 inches

Volume of the sand in the fish tank (V) = Length x Width x Height

= 71 x 18 x 5

= 6390 cubic inches

Case 4: 6 inch base of sand

Height of base (H) = 6 inches

Volume of the sand in the fish tank (V) = Length x Width x Height

= 71 x 18 x 6

= 7668 cubic ...