SOLUTION: 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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Question 108189: how many liters of a 30% solution must be added to 25 liters of 15% solution to make a solution that is 25% salt?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
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