SOLUTION: How much pure acid should e added to 51 cc of 12% acid to increase the concentration of 15%?

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Question 561093: How much pure acid should e added to 51 cc of 12% acid to increase the concentration of 15%?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
percent ---------------- quantity
Acid solution 12 ----------------51 cc
Pure acid 100 ----------------x cc
Mixture 15 ----------------51 + x cc

12*51+100x=15(51+x)
612+100 x=765+15x
100x-15x=765-612
85 x = 153
/ 85
x= 1.8 cc of Pure acid