Question 686859
I am working with 200 ML   I have a mix of 80% Glycol and 20% glycerin  How many ML of glycerin do I add to get to a 50/50  mix ?   
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Let x = amount (ML) of glycerin added
then
.20(200) + x = .50(200+x)
40 + x = 100 + .50x
40 + .50x = 100
.50x = 60
x = 120 ML