SOLUTION: a solution contains 8% salt. How much water should be added to 70 ounces of this solution to make a 2.5% solution?

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Question 1054478: a solution contains 8% salt. How much water should be added to 70 ounces of this solution to make a 2.5% solution?
Answer by ikleyn(52786) About Me  (Show Source):
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a solution contains 8% salt. How much water should be added to 70 ounces of this solution to make a 2.5% solution?
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Let w = the volume of water to add, in ounces.

Then the balance equation for salt is

0.08*70 = 0.025*(70+w).

Solve for w and get the answer.

There is entire bunch of the lessons covering various types of mixture problems
    - Mixture problems
    - More Mixture problems
    - Solving typical word problems on mixtures for solutions
    - Word problems on mixtures for antifreeze solutions
    - Word problems on mixtures for alloys
    - Typical word problems on mixtures from the archive
in this site.

Read them and become an expert in solution the mixture word problems.

Also, you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this textbook in the section "Word problems" under the topic "Mixture problems".

The textbook contains many other solved word problems, as well as many other interesting and useful things.