Quants and Reasoning

This group is focused on solving quants and reasoning using the shortest method possible. No formulas are used for solving any maths or reasoning questions

Several litres of acid were drawn off from a 54 litre vessel full of acid and equal amount of water was added. Again the same volume of the mixture was drawn off and replaced by water. As a result now, the vessel contained 24 litres of pure acid. How much of the acid (in litres) was drawn off initially?

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Answer please