SOLUTION: how many liters of an 18% alcohol solution must be added to a 10% alcohol solution to get 20 L of a 15% acohol solution

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Question 486526: how many liters of an 18% alcohol solution must be added to a 10% alcohol solution to get 20 L of a 15% acohol solution
Answer by lwsshak3(11628) About Me  (Show Source):
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how many liters of an 18% alcohol solution must be added to a 10% alcohol solution to get 20 L of a 15% acohol solution
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let x= liters of 18% solution to be added to a 10% solution.
20-x= liters of 10% solution to be mixed with 18% solution.
..
18%(x)+10%(20-x)=15%(20)
.18x+2-.1x=3
..08x=1
x=1/.08=12.5
ans:
12.5 liters of an 18% alcohol solution must be added to a 10% alcohol solution to get 20 L of a 15% acohol solution