The garment factory plans to produce 850 sets of student uniforms. It has been produced for 5 days, and 30 sets are produced every day. The rest will be completed within 20 days, how many sets will be produced per day on average?
服装厂计划生产850套学生服，已经生产了5天，每天生产30套．剩下的要在20天内完成，平均每天要生产多少套？
<gadget id="calculator">30 * 5</gadget>
<output>150</output>

<gadget id="calculator">850 - 150</gadget>
<output>700</output>

<gadget id="calculator">700 / 20</gadget>
<output>35</output>

<result>35</result>