SOLUTION: Please help me with this question,How many grams of pure water must be added to 40 grams of a 10% saline solution to make a saline solution that is 5% salt?

Question 1174496: Please help me with this question,How many grams of pure water must be added to 40 grams of a 10% saline solution to make a saline solution that is 5% salt?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
How many grams of pure water must be added to 40 grams of a 10% saline solution to make a saline solution that is 5% salt?
Very easy, the amt of salt does not change only the amt of liquid
.10(40) = .05(w+40)
4 = .05w + 2
4 - 2 = .05w
2 = .05w
w = 2/.05
w = 40 grams to be added, which is what you would expect if you half the percent
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