mixture percents

Monico needs to mix a 10% fungicide solution with a 60% fungicide solution to create 100 millileters of a 40% solution. How many millileters of each solution must Monico use?
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1 Answer

want 100 cc at 40%

eq 1: x+y=100    or y=100-x

eq 2: 0.1x +0.6y=40

0.1x +0.6*(100-x)=40

0.1x-0.6x +60=40

-0.5x=40-60=-20

x=20/0.5=40

y=60
by

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