The store shipped 4 boxes of towels. There are 400 towels in total. There are 5 packs in each box. How many towels are in each pack?
商店运来4箱毛巾，一共有400条，每箱有5包，每包有多少条？
<gadget id="calculator">400 / 4 / 5</gadget>
<output>20</output>

<result>20</result>