A can contains a mixture of two liquids X and Y in the ratio 7:5 when 9 liters of mixture are drawn off and the can is filled with Y, the ratio of X and Y becomes 7:9. How many liters of liquid A were contained by the can initially?

Options
- 12 Litres
- 21 litres
- 13 litres
- 22 litres

CORRECT ANSWER : 21 litres

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