The density is a bit lowered.
You get a mix of alcohol and water You get dull beer.
It dilutes the alcohol content.
it cools it
684 ml
4 litres
There are 3 litres of alcohol in your starting mixture of 4 litres. If you add 6 litres of water you will have 3 litres of alcohol in a total of 10 litres. This is the required strength.
Add 5% water
Because the concentration of alcohol is lower; you pay the alcohol not the water.
If the concentration of alcohol and water solution is 25 percent alcohol by volume, the volume of alcohol in a 200 solution is 50.
16%
happens
You mix the pure alcohol with something else, for example, water.