The factory needs to process 4,500 parts, and it is planned to complete it in 15 days. Due to the addition of some workers, it actually processes 150 more parts per day than planned. How many days did it actually take the factory to complete this task?
工厂要加工4500个零件，计划用15天完成，由于增加了一些工人，实际每天比计划多加工150个，工厂完成这项任务实际用了多少天？
<gadget id="calculator">4_500 / 15</gadget>
<output>300</output>

<gadget id="calculator">300 + 150</gadget>
<output>450</output>

<gadget id="calculator">4_500 / 450</gadget>
<output>10</output>

<result>10</result>