The production team processed a batch of parts. It was originally planned to take 14 days to process 1500 parts per day on average. Actual processing of 2100 parts per day. How many days was the task actually completed in advance? (solution in two ways)
生产小组加工一批零件，原计划用14天，平均每天加工1500个零件．实际每天加工2100个零件．实际提前多少天完成任务？(用两种方法解)
<gadget id="calculator">14 / 2_100</gadget>
<output>1/150 = around 0.006667</output>

<gadget id="calculator">1_500 * (1/150)</gadget>
<output>10</output>

<gadget id="calculator">14 - 10</gadget>
<output>4</output>

<result>4</result>