Master Wang needs to process 520 parts, 352 of which have already been made, and the remaining parts will be completed in 7 days. How many parts are made on average per day?
王师傅要加工520个零件，已经做了352个，剩下的零件用7天时间完成，平均每天要做多少个零件？
<gadget id="calculator">520 - 352</gadget>
<output>168</output>

<gadget id="calculator">168 / 7</gadget>
<output>24</output>

<result>24</result>