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A can contains a mixture of two liquids...

A can contains a mixture of two liquids A and B in the ratio `7:5` .When 9 litres of mixture is taken out and same amount of 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 intially ?

A

10

B

20

C

21

D

25

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The correct Answer is:
C
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