There are 4 bookshelves, each shelf has 5 layers, each layer can hold 48 books, how many books can be placed in total?
有4个书架，每个书架有5层，每层可以放48本书，一共可以放多少本？
<gadget id="calculator">48 * 5 * 4</gadget>
<output>960</output>

<result>960</result>