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Quantity of soda in 165 litres of mixture = (6/11) × 165 = 90 litres Quantity of water in 165 litres of mixture = (5/11) × 165 = 75 litres According to question, Water remains same till the end of the process, So final quantity of soda in the mixture = 75 × (9/5) = 135 litres Quantity of soda to be added = 135 – 90 = 45 litres
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