There are 828 books to be placed in 4 bookcases, each bookcase has 3 layers, how many books are placed on each layer on average?
有828本书要放在4个书柜里，每个书柜有3层，平均每层放几本书？
<gadget id="calculator">828 / 4 / 3</gadget>
<output>69</output>

<result>69</result>