1.

A bottle contains 20 litres of liquid A. 4 litres of liquid A is taken out of it and replaced by same quantity of liquid B. Again 4 litres of the mixture is taken out and replaced by same quantity of liquid B. What is the ratio of quantity of liquid A to that of liquid B in the final mixture?

A. 4 : 1
B. 5 : 1
C. 16 : 9
D. 17 : 8
Answer» D. 17 : 8


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