SOLUTION: How much of an 18% solution of sulfuric acid should be added to 360 mL of a 10% solution to obtain a 15% solution?

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Question 853099: How much of an 18% solution of sulfuric acid should be added to 360 mL of a 10% solution to obtain a 15% solution?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.18x+.10*360=.15(x+360)
x=600