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Innovating the answers of the People's Education Edition of the first volume of mathematics in the third grade.
Because the number of books on the last three shelves is equal, the books on the three shelves are all 450/3= 150 (books), and C takes out 30 books and puts them in A. That is to say, before C takes out 30 books, A has 150-30= 120 (books) on the shelf.
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