In order to enrich the student library, the school bought 756 new books and put them on 3 bookshelves. Each shelf has 6 floors. How many books are placed on each floor on average?
学校为充实学生图书室，买来756本新书，放在3个书架上，每个书架有6层，平均每层放多少本书？
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">756 / 18</gadget>
<output>42</output>

<result>42</result>