SOLUTION: How many litres of 50% alcohal solution and 20% alcohal solution must be mixed to obtain 18 Liters of 30% alcohal solution?

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Question 528292: How many litres of 50% alcohal solution and 20% alcohal solution must be mixed to obtain 18 Liters of 30% alcohal solution?

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How many litres of 50% alcohol solution and 20% alcohol solution must be mixed to obtain 18 Liters of 30% alcohol solution?
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Equation:
active + active = active
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0.50x + 0.20(18-x) = 0.30*18
Multiply thru by 100 to get:
50x + 20*18 - 20x = 30*18
30x = 10*18
x = 6 liters (amt. of 50% solution needed
18-x = 12 liters (amt. of 20% solution needed.
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