SOLUTION: how many ounces of pure water must be added to 75 ounce of a 20% salt solution to make a salt solution which is 15% salt?

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Question 102512: how many ounces of pure water must be added to 75 ounce of a 20% salt solution to make a salt solution which is 15% salt?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
how many ounces of pure water must be added to 75 ounce of a 20% salt solution to make a salt solution which is 15% salt?
:
Let x = amt of water to be added:
:
.20(75) = .15(75+x)
:
15 = 11.25 + .15x
:
15 - 11.25 = .15x
:
3.75 = .15x
:
x = 3.75/.15
:
x = 25 ounces of pure water to be added
:
:
Check solution using the salt content:
.20(75) = .15(75 + 25)
15 = 15