A library has 24 identical bookshelves, each shelf has 4 layers, and each layer holds 250 books. How many books can these bookshelves hold in total?
一个图书馆有24个同样的书架，每个书架有4层，每层放250本书．这些书架一共能放多少本书？
<gadget id="calculator">24 * 4 * 250</gadget>
<output>24_000</output>

<result>24_000</result>