The processing factory of Dashuzhuang Primary School needs to make 4,200 sets of teaching aids, and it is planned to be completed in 10 days. The actual production is 180 sets more than planned every day. How many days will it actually take to produce this batch of teaching aids?
大树庄小学加工厂要制做4200套教具，计划10天完成，实际每天比计划多生产180套，生产这批教具实际要用多少天？
<gadget id="calculator">4_200 / 10</gadget>
<output>420</output>

<gadget id="calculator">420 + 180</gadget>
<output>600</output>

<gadget id="calculator">4_200 / 600</gadget>
<output>7</output>

<result>7</result>