A can is full of a mixture of two liquids A and B in the ratio of 7 : 5. When 9 litres of mixture are drawn off from the can and replaced by the same quantity of liquid B, the ratio of A and B in the can becomes 7 : 9. The capacity of the can is
A) 10 litres
B) 20 litres
C) 21 litres
D) 36 litres
Correct Answer : D) 36 litres
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