A workshop produces 500 parts in the morning, which is 2 times less than the parts produced in the afternoon. How many parts will be produced in the afternoon. (column equation solution)
某车间上午生产零件500个，比下午生产的零件的2倍少2个．下午生产零件多少个．(列方程解答)
<gadget id="calculator">2 + 500</gadget>
<output>502</output>

<gadget id="calculator">502 / 2</gadget>
<output>251</output>

<result>251</result>