Question 408567
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Hi
Let x represent amount of the 50% solution
Question states***
 .50x + .15*10L = .25(10L + x)
     .25x = .10*10L
        x = 4L  
CHECKING our Answer***
.50*4 + .15*10 = 2 + 1.5 = 3.5 = .25*14