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To determine the better buy, we need to compare the cost per lesson for each package.
For Package A, Millie will pay $230 for 20 lessons. Therefore, the cost per lesson would be $230/20 = $11.50 per lesson.
For Package B, Millie will pay $180 for 15 lessons. Therefore, the cost per lesson would be $180/15 = $12 per lesson.
Since the cost per lesson is lower for Package A ($11.50) compared to Package B ($12), Millie should choose Package A as the better buy. This means that Millie would be able to get each swimming lesson at a lower cost with Package A.