Question

Angela is putting a new fish tank in her office and needs to know how much water she will need to put in the tank. The fish tank is a rectangular prism with a length of 20 inches, a width of 10 inches, and a height of 8 inches. When she puts water in the tank, she will need to leave 10 percent of its volume empty to leave room for the fish. Which of the following expressions gives the number of cubic inches of water Angela should put in the tank?

Answer 1

Volume of water to add (in³) = (length x width x height) - (0.10)(length x width x height)

Explanation:

You did not post the choices for expressions, but here's how to solve the problem:

Volume = length x width x height = lwh = (20 in)(10 in)(8 in) = 1600 in³

10% less volume = (1600 in³)(0.10) = 160 in³

Final answer:

number of cubic inches of water Angela should put in the tank =

1600 in³ - 160 in³ = 1440 in³

An expression to solve the problem is:

Volume of water to add (in³) = (length x width x height) - (0.10)(length x width x height)