A cubical water tank has each edge 5m long. Find the volume of water in the tank if 1/5th of the tank is empty.

Pls help...
Urgent***

volume if full = 5^3 = ...

but 1/5 is empty, so ?? is filled with water

water = ?? * 5^3 = ....

Answer is 100m^3

Pls help

To find the volume of water in the tank, we need to first calculate the volume of the entire tank and then subtract the volume of the empty portion.

The volume of a cube is found by cubing the length of one of its sides. In this case, each edge of the cube is 5m, so the volume of the entire tank is:

Volume of the tank = (Length of one side)^3 = 5m x 5m x 5m = 125 cubic meters

Next, we need to find the volume of the empty portion, which is 1/5th of the tank. To calculate this, we multiply the volume of the tank by 1/5:

Volume of the empty portion = (1/5) x Volume of the tank = (1/5) x 125 cubic meters = 25 cubic meters

Finally, to find the volume of water in the tank, we subtract the volume of the empty portion from the volume of the tank:

Volume of water in the tank = Volume of the tank - Volume of the empty portion
= 125 cubic meters - 25 cubic meters
= 100 cubic meters

Therefore, the volume of water in the tank is 100 cubic meters.