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12: average font size mostly used in books.

250: average word number per page in a book.

64,000: average number of words in a book.

256: average number of pages in a book.

12: average number of books each person reads over the course of a year.

129,864,880: total of existing books in the entire world according to a 2010 survey.

687,200,000: total of books sold in 2017.