Master Li has to process 360 parts, a total of 60 parts are processed in 5 days, and the rest will be completed in 15 days. How many of the rest are processed per day on average?
李师傅要加工360个零件，5天一共加工了60个，剩下的要15天完成．剩下的平均每天加工多少个？
<gadget id="calculator">360 - 60</gadget>
<output>300</output>

<gadget id="calculator">300 / 15</gadget>
<output>20</output>

<result>20</result>