The volume of water present in a water tank can be measured in _________.
A gallon is a unit of volume in imperial units which is equal to eight pints or 4.55 litres.
A storage tank is in the form of a cube. When it is full of water, the volume of water is 15.625 m3. If the present depth of water is 1.3 m, then find the volume of water already used from the tank.