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How many milliliters of each solution should be used?

A 5% solution of a drug is to be mixed with some 15% solution and some 10% solution to get 20 ml of 8% solution. The amount of the 5% solution used must be 2 ml more than the sum of the other two solutions. How many milliliters of each solution should be used?

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Let call the amounts of 5%, 10% and 15% solutions a, b and c (ml). We ...

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