Question 673799
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Hi,
Juan needs to mix a 30% ethanol solution{{{highlight(200-x)}}} with a 60% ethanol solution{{{highlight(x)}}} 
to create 200 millileters of a 57% solution.
Mixing Algebraically
 .30(200-x) + .60x = .57•200
       .30x = .27•200
          x = 180mm of the 60%  and 20mm of the 30%