SOLUTION: How much water must be added to a 40 liters of a 30% salt solution to produce a 25% salt solution?

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Question 149894: How much water must be added to a 40 liters of a 30% salt solution to produce a 25% salt solution?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
How much water must be added to a 40 liters of a 30% salt solution to produce a 25% salt solution?
.
Let x = amount of water added
.
Started with:
40 liters
of which .30(40) = 12 liters is salt
.
12 = .25(40+x)
12 = 10 + .25x
2 = .25x
8 liters = x