Only the formula is not counted: A school processing factory has to complete the production task of 560 sets of teaching aids, and plans to make 28 sets per day, but actually makes 7 sets more than planned every day. How many days will it actually take to complete the task?
只列式不计算：某校加工厂要完成560套教具的制作任务，计划每天做到28套，实际每天比计划多做7套，实际完成任务要用多少天？
<gadget id="calculator">28 + 7</gadget>
<output>35</output>

<gadget id="calculator">560 / 35</gadget>
<output>16</output>

<result>16</result>