two container contains a mixture of pepsi and coke. in container 1, pepsi and coke are in the ratio of 3:2 and in container 2, they are in the ratio of 2:3. how many litres of mixture will be required from container 1 to be mixed with appropriate quantity of mixture from container 2 to make 20 litres of mixture containing pepsi and coke in the ratio 9:11?