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A container contains a mixture of two liquids 'P' and 'Q' in the ratio of 7:5. When 9 litres of mixture is drawn off

A container contains a mixture of two liquids 'P' and 'Q' in the ratio of 7:5. When 9 litres of mixture is drawn off and then the container is filled with the same amount of 'Q', then the ratio of 'P' and 'Q' becomes 7:9. How many litres of liquid 'P' was contained by the container initially? 1. 27 litres 2. 21 litres 3. 31 litres 4. 42 litres None of these 5.

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