Hi,

Let x represent the amount of 15% juice

   juice = juice

 .15x ++ .08(14-x) = .10*14L

        .07x = .02*14L

           x = .02*14L/.07

           x = 4L, amt of 15%.  Will take 10L of the 8%

and...

     Note: 1.4L being the amount of actual juice



Note if Decimals bother You, may multply thru by 100 first, if You like:

    15x + 8(14-x) = 140

           7x =  28, x = 4  

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