The factory produced a ratio of parts. It was originally planned to take 15 days to produce an average of 2,000 parts per day. The actual production is 500 more than the plan every day, and how many days it actually took to complete the production task.
工厂生产一比零件，原计划用15天，平均每天生产2000个零件．实际每天比计划多生产500个，实际用了多少天就完成了生产任务．
<gadget id="calculator">2_000 * 15</gadget>
<output>30_000</output>

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

<gadget id="calculator">30_000 / 2_500</gadget>
<output>12</output>

<result>12</result>