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Answer : 3 7:5 Explanation : Answer: C) 7:5 Explanation: Milk in 1-litre mixture of A = 4/7 litre. Milk in 1-litre mixture of B = 2/5 litre. Milk in 1-litre mixture of C = 1/2 litre. By rule of alligation we have required ratio X:Y      X                  :                 Y    4/7                                2/5                                   /              (Mean ratio)                   (1/2)            /                       (1/2 – 2/5)     :       (4/7 – 1/2)      1/10                      1/1 4  So Required ratio = X : Y = 1/10 : 1/14 = 7:5

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