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

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Question 98681: How many ounces of pure water must be added to 75 oz of a 20% salt solution to make a salt solution which is 15 % salt?
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
70*.2+=.15(70+x)
14=10.5+.15x
.15x=14-10.5
x=3.5/.15
x=23.333 ounces of pure water is needed.
proof
70*.2=.15*93.333
14=14