A milkman puts 120 litres of pure milk in a container. He removes 30 litres of the solution from the container and replaces it with an equal quantity of water. Thereafter, he again removes 30 litres of the solution from the container and replaces it with an equal quantity of water. What will be the concentration of milk in the container now?
If he repeats this process till the concentration of milk in the container falls below 30%, then how many times from the beginning does he carry out the process of replacing the solution in the container with water?
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