A can contains a mixture of two liquids A and B in the ratio 7:5. When 9 liters of mixtures are drawn off and the can is filled with B, the ratio of A and B becomes 7:9. How many liters of liquid A was contained by the can initially?
A. 10
B. 20
C. 21
D. 25
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সঠিক উত্তরঃ
C.
21
Explanation:
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