A bookshelf has three layers, with an average of 12 books on each layer. There are 11 such bookshelves in the library, how many books can be placed there?
一个书架有三层，平均每层放12本书．图书馆有11个这样的书架，可以放多少本书？
<gadget id="calculator">12 * 3 * 11</gadget>
<output>396</output>

<result>396</result>