A vessel contains a mixture of two liquids a and B in the ratio 7:5.When 9 litres of mixture is drawn off and the flask is filled with liquid B the new ratio of a to b becomes 7:9.How many litres of A was initially present in the flask?
a)20
b)24
c)21
d)10
E)15
Is gre quant much tougher than it was in the past?
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