A vessel contains milk and water in the ratio 3 : 1. What fraction of the mixture must be drawn off and replaced with water so that the ratio becomes 3 : 2?
Correct answer D. 1/5
Explanation
Milk fraction goes from 3/4 to 3/5. So (1 - f) x 3/4 = 3/5, giving 1 - f = 4/5 and f = 1/5.
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