The factory has to process 300 parts, and it has been processing for 5 days, with an average of 40 parts per day. The rest will take 4 days to complete, how many pieces will be processed on average per day?
工厂要加工300个零件，已经加工了5天，平均每天加工40个．余下的要4天完成，平均每天还要加工多少个？
<gadget id="calculator">5 * 40</gadget>
<output>200</output>

<gadget id="calculator">300 - 200</gadget>
<output>100</output>

<gadget id="calculator">100 / 4</gadget>
<output>25</output>

<result>25</result>