I have been using 24mg ejuice and want to go to 18 or 16mg now. It is now available from the supplier I order from. Since I'm not a math whiz I need help with a formula. If I order 24mg and the same flavor 11mg what amounts of each would I mix to get approximately 18mg or 16mg? It doesn't have to be an exact mg amount, approximate is fine. Thanks to anyone that can help with this question.