SOLUTION: how much pure acid must be added to 500 ml of an 8% acid solution to make a 20% acid solution?

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Question 469392: how much pure acid must be added to 500 ml of an 8% acid solution to make a 20% acid solution?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
n+500(.08)=.2(n+500)
n+40=.2n+100
.8n=60
n=60/.8=75 ml of pure acid necessary for the solution..