It takes 52 hours for one person to finish sorting out a batch of books. Now it is planned that some people will do it for four hours first, and then two more people will work with them for eight hours. Assuming that these people have the same work efficiency, how many people should be assigned to work first?

Let's arrange x people to work first. From the meaning of the question: 4x52 + 8 (x + 2) 52 = 1, the solution is: x = 3

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