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Quantity of milk in the initial mixture = 155 × 0.42 = 65.1 litres Quantity of water in the initial mixture = 155 – 65.1 = 89.9 litres Quantity of water is unchanged in the final mixture. So, Quantity of final mixture = (89.9/31) × 100 = 290 litres Quantity of milk in final mixture = 290 – 89.9 = 200.1 litres Value of ‘x’ = 200.1 – 65.1 = 135