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How much of a 4% acid solution should be
mixed with 36 liters of an 8% acid solution
to create a mixture that is 7% acid?
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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 2.
This problem is very similar to yours.
In this lesson you will find the detailed solution.
Consider it as a sample. Read it attentively.
Then solve your problem by substituting your data.
In this way you will learn once and for all how to solve problems like this.
