The washing machine factory needs to produce 480 washing machines. It was originally planned to be completed in 30 days, but the actual production is 4 more than planned every day. How many days is it actually completed?
洗衣机厂要生产480台洗衣机，原计划30天完成，实际每天比计划多生产4台，实际多少天完成？
<gadget id="calculator">480 / 30</gadget>
<output>16</output>

<gadget id="calculator">16 + 4</gadget>
<output>20</output>

<gadget id="calculator">480 / 20</gadget>
<output>24</output>

<result>24</result>