SOLUTION: "Set up an equation and solve the following problem. How many liters of pure alcohol must be added to 20 liters of a 30% solution to obtain a 90% solution?"
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Question 741200: "Set up an equation and solve the following problem. How many liters of pure alcohol must be added to 20 liters of a 30% solution to obtain a 90% solution?"
Can I get help with how to work this problem?
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Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
(Amount of alcohol)/(amount of total solution) = (concentration of alcohol)
Let v = unknown liters amount of pure alcohol, 100% to add.
Amount of alcohol = v*100+20*30
Amount of resulting solution = v+20
Concentration of alcohol expected for resulting solution = 90%
Form the proper equation and solve for the unknown variable, v.
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