Uncle Wang needs to make 580 parts, 180 of which have already been made, and the remaining 50 parts are made every day. How many days will it take to complete?
王叔叔要做580个零件，已经做好180个，剩下的每天做50个，需要几天完成？
<gadget id="calculator">580 - 180</gadget>
<output>400</output>

<gadget id="calculator">400 / 50</gadget>
<output>8</output>

<result>8</result>