SOLUTION: in chemistry class, 21 liters of 12% alcohol solution must be mixed with 20% solution to get 14% solution. How many liters of the 20% solution are needed?

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Question 841334: in chemistry class, 21 liters of 12% alcohol solution must be mixed with 20% solution to get 14% solution. How many liters of the 20% solution are needed?
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi,

21 liters of 12% alcohol solution must be mixed with 20% solution to get 14% solution. 

How many liters highlight_green%28x%29of the 20% solution are needed?

Set UP

 alcohol = alcohol

 .12*21 + .20x = .14(21+x)

            x = .02*21/.06