ratios and proportions

Level pending

A milk man has initially some amount of milk with him.After some time he has taken away 9 litres of milk from his can and added 9 litres of water added to it such that the initial volume remains same.From the resultant mixture he has taken away same 9 litres and added further 9 litres of water to it.At last he found the ratio of milk to water is 16 : 9 . Find the initial amount of pure milk in the can.

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