SOLUTION: A 20 gallon solution contains 50% salt. How much pure water needs to be added in it to get a solution that contains 30% salt?

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Question 403826: A 20 gallon solution contains 50% salt. How much pure water needs to be added in it to get a solution that contains 30% salt?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
A 20 gallon solution contains 50% salt.
How much pure water needs to be added in it to get a solution that contains 30% salt?
:
Let w = amt of water required
The actual amt of salt will stay the same, only the percent changes
.50(20) = .30(w + 20)
10 = .3w + 6
10 - 6 = .3w
s = 4%2F.3
w = 131%2F3 gal of pure water to be added
:
:
Check for amt of salt: .3(13.333 + 20) = 10