A can contains a mixture of two liquids A and B in the ratio 7 : 5. When 9 litres of mixture are drawn off and the can is filled with B, the ratio of A and B becomes 7 : 9. How many litres of liquid A was contained by the can initially?
Correct Answer: 21
Explanation:
Suppose the can initially contains 7x and 5x litres of mixtures A and B respectively
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