SOLUTION: how much of an 80% nitric acid solution must be added to a 125gram solution of 10% nitric acid to produce a 50% nitric acid solution?

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Question 296083: how much of an 80% nitric acid solution must be added to a 125gram solution of 10% nitric acid to produce a 50% nitric acid solution?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.8x+125*.1=(125+x)*.5
166 2/3=x