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Question

A, B, and C can individually complete a task in 20 days, 15 days, and 10 days, respectively. B and C begin the task and work together for 3 days, after which both of them leave. How many days will it take for A to finish the remaining work by themselves?

A 15 days

B 12 days

C 10 days

D 8 days

E None of these

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