Each bookshelf has 3 floors, and each floor can hold 16 books. There are 20 such bookshelves in the school. How many books can be put in total.
每个书架有3层，每层可放书16本书，学校有20个这样的书架．一共可放书多少本．
<gadget id="calculator">16 * 3 * 20</gadget>
<output>960</output>

<result>960</result>