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OpenStudy (anonymous):
How much water must be added to 12 L of a 40% solution of alcohol to obtain a 30% solution? A. .5 L B. 5 L C. .4 L D. 4 L
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OpenStudy (anonymous):
4 liters .. 40% of the 12 liter are 4.8 liters of alcohol, when adding 4 liters of waters the total volume of the solution is 16 liter .. so the alcohol is now 4.8/16=0.3 i.e 30 percent.
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