Question 635395
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Hi,
needing 10 liters of the 15% acid solution... 
How many liters of 10%{{{highlight(y)}}} solution and 30% solution{{{highlight(x)}}} 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...
{{{.3*2.5 + .1*7.5 = 1.5}}}