Each bookshelf has 5 layers, and each layer can hold 18 books. There are a total of 12 such bookshelves in the school library viewing room. How many books can be placed in total?
每个书架有5层，每层可放18本书．学校图书观室一共有12个这样的书架，一共可以放书多少本？
<gadget id="calculator">18 * 5 * 12</gadget>
<output>1_080</output>

<result>1_080</result>