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After each replacement, the amount of milk reduces by a factor of (quantity left / total quantity). Milk remaining after the first replacement = 80 × (60/80) = 60 liters. Milk remaining after the second replacement = 60 × (60/80) = 45 liters. Milk remaining after the third replacement = 45 × (60/80) = 36 liters. Correct Option: b
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