Question 667297
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Hi,
How much 15% solution{{{highlight(60-x)}}} and How much 50% solution{{{highlight(x)}}} should be mixed together 
to make 60 gallons of a 30% solution?
{{{ .50x + .15(60-x) = .30*60}}}
      {{{ .35x = .15*60}}}
             {{{x = .15*60/.35}}}