What quantity of 65% acid solution must be mixed with a 30% solution to..

What quantity of 65 per cent acid solution must be mixed with a 30 per cent solution to produce 105 mL of a 50 per cent solution?
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1 Answer

1. 0.65x +0.3y=0.5(x+y)... 2. x+y=105, or y=105-x... 0.65x +0.3*(105-x)=0.5(105)... 0.65x -0.3x +31.5=52.5... 0.35x=52.5-31.5 =21... x=21/0.35=60... y=105-60=45
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