Master Wang and three apprentices used the machine to process 612 parts in 3 days. How many parts does each person process on average per day?
王师傅和三个徒弟，用机器3天加工了612个零件，平均每人每天加工多少个零件？
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">612 / 4 / 3</gadget>
<output>51</output>

<result>51</result>