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Find the amount of 6% acid solution and the amount of 14% acid solution that should be combined to make a 55 cc of a 12% solution
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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 that 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 how to solve problems like this, once and for all.