Quantity of soda in 99 litres of mixture = (6/11) × 99 = 54 litres Quantity of water in 99 litres of mixture = (5/11) × 99 = 45 litres According to question, Water remains same till the end of the process, So final quantity of soda in the mixture = 45 × (9/5) = 81 litres Quantity of soda to be added = 81 – 54 = 27 litres
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