There used to be 350 fairy tale books in the library, but now the number is twice as much as before, and there is less 10. How many books are there in the library now?
(1)25×2+ 10, =50+ 10, =60 (Ben) A: There are 60 story books. (2) There are twice as many story books as literature books, and there are 10 story books and literature books. (25×2+ 10)+25, =60+25, =85 (Ben) A: There are 85 story books and literature books.