SOLUTION: how many liters of 20% alcohol solution and 10% alcohol solution must be mixed to obtain 50 liters of a 12% alcohol solution?

Question 355242: how many liters of 20% alcohol solution and 10% alcohol solution must be mixed to obtain 50 liters of a 12% alcohol solution?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let A be the amount of 20% solution, B the amount of 10% solution.
Total volume:
1.
.
.
Total concentration:

2.
.
.
Subtract eq. 1 from eq. 2,

liters
Then from eq. 1,

liters
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