A cube-shaped tank with an edge length of 20 centimetres contains 3.75 litres of water. The capacity of the tank is 8L. How much more water is needed to fill the tank completely?

Answer 1

The volume of the cube-shaped tank is the cube of the edge length: 20^3 = 8,000 cubic centimeters (or milliliters).

Since 1 liter is equal to 1,000 milliliters, the tank already contains 3.75 x 1,000 = 3,750 milliliters of water.

The remaining capacity of the tank is 8 x 1,000 = 8,000 milliliters.

To fill the tank completely, we need 8,000 - 3,750 = 4,250 milliliters more water.

Therefore, we need 4.25 liters more water to fill the tank completely.