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A Jar is filled with liquid, 4 parts of which are spirit and 5 parts of milk. What fraction of the mixture must be

A Jar is filled with liquid, 4 parts of which are spirit and 5 parts of milk. What fraction of the mixture must be drawn off and replaced with spirit so that the amount of spirit and milk in the mixture may become equal? 1. 2/2 2. 1/10 3. 2/10 4. 4/1 5. None of these

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