Question
A, B, and C are working together on a project. A can complete the project alone in 15 days, B in 20 days, and C in 30 days. On the first day, A, B, and C work together. On the second day, A and B work together. On the third day, B and C work together. This pattern repeats in the same order. How many days will it take to complete the entire project?
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