SOLUTION: how many ounces of pure water must be added to 75oz. of an 8% salt solution to make a 5% salt solution?

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Question 398250: how many ounces of pure water must be added to 75oz. of an 8% salt solution to make a 5% salt solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
.08%2A75+%2F+%28w+%2B+75%29+=+.05
6%2F%28w+%2B+75%29+=+.05
6+=+.05%2A%28w+%2B+75%29
6+=+.05w+%2B+3.75
.05w+=+2.25
w+=+45
45 ounces of pure water must be added