SOLUTION: pure acid is to be added to a 10% acid solution to obtain 90L of 19% solution. what amounts of each should be added?

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Question 469053: pure acid is to be added to a 10% acid solution to obtain 90L of 19% solution. what amounts of each should be added?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
n+.1(90-n)=90(.19)
n+9-.1n=17.1
.9n=8.1
n=8.1/.9=9
9L of pure acid should be mixed with 81L of 10% acid for your mix..