Question 1016562
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A pharmacist needs to make 15 ounces of a 20% alcohol solution by mixing together a 10% alcohol solution 
with 40% alcohol solution. How much of each solution should he use?
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It is a typical mixture word problem.

See the lesson <A HREF=http://www.algebra.com/algebra/homework/word/mixtures/Solving-typical-mixture-problems.lesson>Solving typical word problems on mixtures for solutions</A> in this site, Problem 1.

This problem is very similar to yours.

In this lesson you will find the solution. 

Consider it as a sample. Read it attentively.

Then solve your problem by substituting your data.

Good luck!
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