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A drum contain 20 litres of a paint. From this 2 litres of paint is taken out and replaced by 2 litres of oil.Again 2 litres of this mixture is taken out and replaced by 2 litres of oil.If this operation is performed once again,then the final ratio of the paint and the oil in the drum would be ? 1. 271:729 2.172:279 3. 3:7 can u explain the answer