Question

A bucket contains a mixture of two liquids A and B in the prop of 7 : 5. If 9 litres of the mixture is replaced by 9 litres of liquid B, then the ratio of two liquids becomes 7 : 9. How much of liquid A was there in the bucket?

Answer 1

7 remains constant so we leave it and see 5 is now 9 thats 4 units and change is 9 litres actually.. that means 4 units of the ratio is 9 lotres actually.. hence liquid A is 7*9/4=15.75litres