A bookstore sells three types of books: novels, textbooks, and comic books. The store sold a total of 120 books last month. The number of novels sold was twice the number of textbooks sold, and the number of comic books sold was 10 more than the number of textbooks sold. If the store rounds the number of novels sold to the nearest ten, how many novels were sold? Let's think step by step and output the final answer within \boxed{}.
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