In the "Welcome to the Olympics, Create a Civilized City" publicity campaign, Wenhua Road Primary School plans to distribute 500 promotional materials. The first 4 will distribute 80 copies per day on average, and the rest will distribute 60 copies per day. How many days will it take for the remaining ones to be distributed?
在"迎奥运，创文明城"宣传活动中，文化路小学准备发放500份宣传材料，前4前平均每天发放80份，剩下的每天发放60份，剩下的需要几天才能发完？
<gadget id="calculator">4 * 80</gadget>
<output>320</output>

<gadget id="calculator">500 - 320</gadget>
<output>180</output>

<gadget id="calculator">180 / 60</gadget>
<output>3</output>

<result>3</result>