Master Wang produces 640 parts in 8 hours, and Master Li produces 130 parts per hour. On average, how many parts does Wang produce less than Master Li per hour?
王师傅8小时生产640个零件，李师傅每小时生产130个零件，王师傅平均每小时比李师傅少生产多少个零件？
<gadget id="calculator">640 / 8</gadget>
<output>80</output>

<gadget id="calculator">130 - 80</gadget>
<output>50</output>

<result>50</result>