Math! It's What's For Mixer!
30ml at 3mg/ml would mean 30ml * 3mg/ml = 90mg. (see how ml * 1/ml canceled each other out?)
So, you know you need 90mg for the entire bottle now and you have 100mg/ml so math will involve canceling out the mg's this time. So 90mg / 100mg/ml = 0.9ml
Now in a 30ml bottle there is 0.9ml of 100mg/ml nicotine and 29.1ml of PG, VG, and flavoring.
Double check, 90mg / 30ml = 3mg/ml
All the units work and the double check calculation works, so all that remains is to accurately measure the liquids.
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