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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 Solving typical word problems on mixtures for solutions 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!