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Answer : 2 320 ml Explanation : Answer: B) 320 ml Explanation: Here total parts of milk and water in the solution is 6 2 = 8 parts.1part = 640/8 = 80 old mixture contains 6parts of milk and 2 parts of water(6:2). To get new mixture containing half milk and half water, add 4parts of water to the old mixture then 6:(2 4) to make the ratio same.i.e, 4 x 80 = 320 ml.

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