SOLUTION: how many liters of water should be added to a 30-liter solution that is 45% salt in order to dilute it to 20% salt?

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Question 907752: how many liters of water should be added to a 30-liter solution that is 45% salt in order to dilute it to 20% salt?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
water = water
x the amount of water to add
.55(30L) + x = .80(30L + x)
x = .25(80L)/.20