Question

A jar contains a mixture of two liquids A and B in the ratio 7:5. When 9 litres of mixture
are drawn off and the jar is filled with B, the ratio of A and B becomes 7:9. How many
litres of liquid A was contained by the jar initially?
(1) 10
(2) 21
(3) 18
(4) 15

Answer 1

Answer:

21

Step-by-step explanation:

Initial

A=7x ,B=5x , Mix.=12x

After removing 9 lit. n filled by B mix.=12x-9

A=7/12(12x-9) ,B=5/12(12x-9)+9

A:B=7:9

solving these x=3

Initial A=7x=7*3=21 Liter