There are 300 popular science books in the school library, more than story books 13. How many story books are there in the library? (Write down the quantitative relationship to solve the problem first, and then answer. Relationship: number of story books ×( 1+ 13)= number of popular science books.

There are x story books in the library, which come from the meaning of the question:

( 1+ 13)x=300

43x=300

x=225

There are 225 story books in the library.