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how many liters of a 30% solution must be added to 25 liters of 15% solution to make a solution that is 25% salt

how many liters of a 30% solution must be added to 25 liters of 15% solution to make a solution that is 25% salt?
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let x be liters of 30% solution. .3x+(.15*25)=.25(x+25) .3x+3.75=.25x+6.25 .05x=2.5 add -.25x-3.75 to each side. .05x/.05=2.5/.05 x=50 liters Ed
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