Hi,

needing 10 liters of the 15% acid solution... 

How many liters of 10% solution and 30% solution should you use?

Note:  y = 10L - x

 .30x + .10(10-x) = .15·10      |May multiply thru by 100 first, if one wishes

            .20x = .5

               x = 2.5L of the 30%  and 7.5L of the 10%

and...

 

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