A druggist wants to reduce a 20 ounce quantity of a 7% solution of iodine to a 4% solution by adding pure alcohol. How much alcohol must he add to accomplish this. (I really need help setting it up.)

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A druggist wants to reduce a 20 ounce quantity of a 7% solution of iodine to a 4% solution by adding pure alcohol. How much alcohol must he add to accomplish this. (I really need help setting it up.)

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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So you begin with 20 ounces and 7% of that is Iodine, that's 1.4 oz. And it needs to be diluted so that the 1.4oz is 4%, so 1.4/.04 = 35oz 20-->35 oz, so 15oz
I wasn't sure if you meant 7% of the 20 oz was Iodine, or 20oz was 7% of the whole thing.

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