The library bought 2,400 new books, which were placed on 4 shelves on average, and each shelf had 6 floors. How many books are placed on each floor on average?
图书馆买来新书2400本，平均放在4个书架上，每个书架放6层．平均每层放多少本？
<gadget id="calculator">2_400 / 4 / 6</gadget>
<output>100</output>

<result>100</result>