Hi guys, I have a quick question about recipe sizes. I have a recipe for a standard 5 gallon batch. If I wanted to do a 3 gallon batch (for a 3 gallon keg), would I just use 3/5 as much of everything? Do I need to use one of the beer tools to figure it out? And would the same apply if I wanted to do a 10 gallon batch? Could I just double everything?