Question 27219
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How much pure salt must be added to to 25 grams of a 12% salt solution to make it a 20% solution.  I am having a very hard time
trying to figure this problem out.  Thanks for your help.

Dennis

With amount of pure salt being S, equation is: .12(25) + S = .2(25 + S)
Solving for S, amount of pure salt to be added = {{{2&1/2}}}, or 2.5 grams.

FYI: The answer is NOT 10 grams, as the other person who responded, states!</pre>