Sorry I don’t understand. Would it be around 25 mg? I’m no good with math.
Ya, JC got it right, 26.5. What did you not get, the symbols I used, or the equation? I'm not tryin' to start a bicker or anything, just so ya know..

Basically, add nic levels together and divide by the number of nic levels you added. If the amounts and the PG/VG ratios are the same, that is.. For instance, while 30 mls of 50 mg/ml 50/50 and 30 mls of 3 mg/ml 50/50 would turn out 60 mls of 26.5 mg/ml 50/50, different amounts of stuff results in different numbers..

The Nic Combine tool in this calculator program (windows only) is useful.
eJuice Me Up - Best eJuice Calculator