How many ancient books were there now?

In ancient times, ten thousand books referred to the number of books in a book, which was usually calculated by the number of words. In ancient times, the length of a book was different from that of a book now, but it was roughly the same. Therefore, the number of ancient books could be determined by calculating the number of words in each book. Assuming that the number of words in each book is the average of the number of words in ancient and modern books, then the number of ancient books is equivalent to the number of words in modern books: 100,000,000,000 × (1000 * 1000) = 100,000,000 books Therefore, the ancient 10,000 books were equivalent to 100,000,000 books in the present.