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Mathematics, 21.06.2019 16:00
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Mathematics, 21.06.2019 18:50
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Mathematics, 21.06.2019 20:50
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Mathematics, 22.06.2019 00:00
How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid in order to get a 40% solution of acid?
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