In a small town library, there are three sections for fiction, non-fiction, and children's books. The fiction section has 120 books, the non-fiction section has 80 books, and the children's section has 50 books. If the library acquires 30 new fiction books, 20 new non-fiction books, and 10 new children's books, what is the average number of books per section after the acquisition? Let's think step by step and output the final answer within \boxed{}.
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