How many oz of pure salt must be added to 16oz of 20% salt solution to produce a 35% solution? (pure salt is 100%). round your answer to the nearest hundredth of an oz.

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4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80