There are 25 identical bookshelves in the library, each shelf has 4 layers, and each layer holds 240 books. How many books can these bookshelves hold in total?
图书馆有25个同样的书架，每个书架有4层，每层放240本书，这些书架一共能放多少本书？
<gadget id="calculator">240 * 4 * 25</gadget>
<output>24_000</output>

<result>24_000</result>