Question 1159360
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needs 80 liters of a 30​% acid solution. He currently has a 20 % solution and a 60 % solution.
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v of 60%
80-v of 20%


{{{60v+20(80-v)=30*80}}}

{{{60v-20v+20*80=30*80}}}

{{{(60-20)v=30*80-20*80}}}

{{{highlight(v=80((30-20)/(60-20)))}}} and you can continue from here.

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