Workers make a batch of parts, and each person makes 8 parts, and there are still 20 parts left; each person makes 6 parts, and there are still 60 parts that have not been made. How many workers are there in total?
工人做一批零件，每人做8个，还差20个零件；每人做6个，则还有60个零件没做，一共有多少位工人？
<gadget id="calculator">60 - 20</gadget>
<output>40</output>

<gadget id="calculator">8 - 6</gadget>
<output>2</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<result>20</result>