Milk or Water Load?

This motorist is taking milk in the drums for distribution in city. It is a general practice by the milkmen to add plenty of water to milk before transporting it the consumers. The milk men should be grateful to Milk as it does not change its colour (though viscosity changes) whether you add water to milk or milk to water and an ordinary customer can not detect the small adulteration.

The driver of the bike may be taking half milk and half water in the drums. I can not say something with certainty but one thing that I am sure about is that pure milk contains about 80 percent water and the rest, minerals like proteins, fats and solid non fat etc. By the way if a milk man adds 20 percent water to milk then it becomes cent percent pure water or milk?