Percentage of Seed to Levain
Let's say the Total Flour Weight in the Total Formula = 1000g
20% flour of Total Flour Weight is used in the Levain. So that = 200g flour
So in a 100% hydration Levain there should be 100g Total Flour and 100g water.
You want to inoculate the Levain with 10% seed that has a hydration of 100%. It seems like you would use 20g of seed. But since the seed is 100% hydration there would be only 10g of flour.
Finally, the question,
Would I need to use 40g of seed and 80g Flour and 80g Water to make this accurate?
I'm working on a spreadsheet, so details like this make a difference in the calculations.