### Brain Teasers

# Mixtures

You have a 10-liter mixture of 90% ethanol and 10% water. How much water would you have to add in order break the mixture down to 50% ethanol?

### Answer

8 liters.Since you start out with 9 liters of ethanol, you need to end up with 18 liters overall for the ethanol content to equal 50%. To get 18 liters, just add 8 liters to the original 10-liter solution.

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