I am having some problems setting this up. Could someone please expain it to me? I am trying to get ready for midterms next week. Thanks in advance!

- Thread starter krisolaw
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I am having some problems setting this up. Could someone please expain it to me? I am trying to get ready for midterms next week. Thanks in advance!

Even with this information, I still can't get the correct answer according to the book. The book tells me the answer is 10 ounces of water. What am I missing? Please explain further. Thanks(15%)(20)=3, so we have 3oz of alcohol.

So how many oz of solution will we need if (10%)(x)=3?

"Mixture" problems are always challenging.How much water should be added to 20 ounces of a 15% solution of alcohol to dilute it to a 10% mixture?

This one gives us concentrations of alcohol, but we're adding water.

We should think in terms of the amount of water in the solution.

We have 20 ounces of solution which is 85% water.

. . We have: 0.85 x 20 = 17 ounces of water.

We will add x ounces of pure water.

. . This mixture will contain

We will have 20 + x ounces of mixture which is supposed to be 90% water.

. . That is, it will have:

Note: We just described the final amount of water in two ways.

And