There are 25 bookshelves in the school library, each with 7 floors. If there are 40 books on each floor, how many books are there in the school library?
学校图书室有25个书架中，每个书架7层．每层放40本书，学校图书室一共有多少本书？
<gadget id="calculator">40 * 7 * 25</gadget>
<output>7_000</output>

<result>7_000</result>