Hi Scasnerkay,
Do you know the percentage of fat in the cream? Is it 40% or 35% etc? You'll need that information. Let's go with 40% for this example though.
Ok, you have 1 cup at 40%. And, you've got some other amount of 3.6% milk. There are 16 cups to a gallon. Let's say you're making a 2 gallon cheese, so that's 32 cups of 3.6% fat milk, and 1 cup of 40% milk, for 33 cups total in our make.
So, you have 32 times 3.6 plus 1 times of 40. 32 times 3.6 is 115.2, and we add to that our 40 from our cup of cream, that's 155.2 in our 33 cups of milk. Divide our 155.2 by 33, to get how much in each cup, and that's 4.7 and small change; meaning you would have 4.7% fat.
- Jeff