There are 25 bookshelves in the school library, each shelf has 6 floors, and each floor contains 240 books. How many books are there in total?
学校图书室有25个书架，每个书架有6层，每层放240本书，一共有多少本书？
<gadget id="calculator">240 * 6 * 25</gadget>
<output>36_000</output>

<result>36_000</result>