Strait Welches 100% juice is SG 1.068, I started with 5 gallons juice,
added added 5 cans concentrate for SG 1.086, added 5 more for my
starting SG 1.100 (now 5 gallons juice and 10 cans concentrate, total
of just under 6 gallons) SG 1.100 gives me a PA of 13%, in 4 days it
was SG 1.012, I added 5 cans concentrate (I would have added more
concentrate in the beginning but only bought 10 cans thinking it would
be enough) to bring me back up to SG 1.030, subtract SG 1.012 and .018
is 2.3 PA. I'm planning to add 5 more cans concentrate tomorrow for a
total PA of 17.6, then I might just let it ferment to dryness.
To answer your first question clearly, I started with 5 gallons juice
and 10 cans concentrate with a starting SG 1.100, 13% PA and pitched my
yeast.