If 75 books are to be divided into 3 packs on average, and each pack is made into 5 boxes, how many books should be contained in one box?
要把75本书平均分成3包，每包装成5盒，一盒要装几本书？
<gadget id="calculator">75 / 3 / 5</gadget>
<output>5</output>

<result>5</result>