SOLUTION: How Many Gallons of a 5% salt solution must be mixed with 200 gallons of a 10% solution to obtain a 9% solution?

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Question 1020694: How Many Gallons of a 5% salt solution must be mixed with 200 gallons of a 10% solution to obtain a 9% solution?
Answer by ikleyn(52914) About Me  (Show Source):
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How Many Gallons of a 5% salt solution must be mixed with 200 gallons of a 10% solution to obtain a 9% 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 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 how to solve problems like this, once and for all.