SOLUTION: to prepare 500 ml of alcohol 20% using alcohol 70% and water. How many milliliters of each are needed?

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Question 701112: to prepare 500 ml of alcohol 20% using alcohol 70% and water. How many milliliters
of each are needed?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
to prepare 500 ml of alcohol 20% using alcohol 70% and water. How many milliliters
of each are needed?
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500 ml of 20% = 100 ml of alcohol
100 ml/0.7 = 142.9 ml of 70%
The rest is water.