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Biology 9 Online
OpenStudy (anonymous):

In a laboratory, two bottles contain mixture of acid and water in the ratio 2 : 5 in the first bottle and 7 : 3 in the second. The ratio in which the contents of these two bottles be mixed such that the new mixture has acid and water in the ratio 2 : 3 is (A) 4 : 15 (B)9 : 8 (C) 21 : 8 (D)1 : 2

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