Question :
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?
1. 21
2. 19
3. 18
4. 17
Answer :
1 - 21
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