How to workout final alcohol percentage

How to workout final alcohol %

Take the total amount of final spirit from the still, then multiple by the current strength, divide this by the strength you want, then minus the start amount of spirit you had. Gives you amount of water to add. "Just An Example Below"

3 litres multiple by 93%, divide by 35% = 7.97 litres of water -  3 litres = 4.97 litres of water to add which will give me my 35% ABV