There are 2 bookshelves in the classroom, each shelf has 3 layers, each layer can hold 125 books, how many books can be placed in total?
教室里有2个书架，每个书架有3层，每层能放125本书，一共能放多少本书？
<gadget id="calculator">125 * 3 * 2</gadget>
<output>750</output>

<result>750</result>