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how much of an 18% solution of sulfuric acid should be added to 360 ml of a 10% solution to obtain a 15% solution?

Here is how I completed the problem:

I started by creating a ratio:



Where 'x' is the desired amount of the 18% solution of sulfuric acid. 

From here, I solved for 'x':









∴You will need to add 1080ml of 18% Sulfuric Acid in order to obtain a 15% solution.