The production team processes a batch of parts. It was originally planned to take 20 days to process 1500 parts per day on average. Actually, 500 more pieces are processed every day, how many days are the processing tasks actually completed in advance?
生产小组加工一批零件，原计划用20天，平均每天加工1500个．实际每天多加工500个，实际提前多少天完成加工任务？
<gadget id="calculator">20 * 1_500</gadget>
<output>30_000</output>

<gadget id="calculator">1_500 + 500</gadget>
<output>2_000</output>

<gadget id="calculator">30_000 / 2_000</gadget>
<output>15</output>

<gadget id="calculator">20 - 15</gadget>
<output>5</output>

<result>5</result>