A container holds a combination of two liquids A and B in a 7:5 ratio. The ratio of A and B becomes 7:9 when 9 litres of mixture are taken out and the can is filled with B. How many litres of liquid A did the can originally hold?
A. 10
B. 20
C. 21
D. 25
Answer:C
A container holds a combination of two liquids A and B in a 7:5 ratio. The ratio of A and B becomes 7:9 when 9 litres of mixture are taken out and the can is filled with B. How many litres of liquid A did the can originally hold?
A. 10 B. 20 C. 21 D. 25