### 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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## Comments

I only had a quick go at it, but it is a

good answer-even though I got a

different one!

FROM

SMITSH03

good answer-even though I got a

different one!

FROM

SMITSH03

they changed the solution b4 it was posted. here is what I had earlier: 90%(10) = 50%(10+x)

solving for x gives 8 liters.

solving for x gives 8 liters.

Well that was easy (no offense)

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