A chemist is making a 50% alcohol solution. How many milliliters of distilled water must the chemist add to 1,000 milliliters of a 70% alcohol solution to obtain a 50% solution?

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A chemist is making a 50% alcohol solution. How many milliliters of distilled water must the chemist add to 1,000 milliliters of a 70% alcohol solution to obtain a 50% solution?