Presently a mixture in a tub contains substances A and B in the ratio – McqOptions

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1.	Presently a mixture in a tub contains substances A and B in the ratio of 7:5. If 9 litres of this solution is drawn out and B is added to the mixture in certain quantity the resulting mixture becomes 7:9. How much litres of liquid A was kept in the tub initially?
A.	32
B.	20
C.	27
D.	21
Answer» E.

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