The master processes 54 parts per hour, and the apprentice processes 280 parts in 8 hours. On average, how many parts are processed by the apprentice less than the master?
师傅每小时加工54个零件，徒弟8小时加工280个零件，徒弟平均每时比师傅少加工多少个零件？
<gadget id="calculator">280 / 8</gadget>
<output>35</output>

<gadget id="calculator">54 - 35</gadget>
<output>19</output>

<result>19</result>