Processing a batch of parts, originally planned to process 15 parts per day, can be completed in a few days. When completing (3/5) of the processing task, adopt new technology, and the efficiency will increase by 20%. As a result, the task was completed 10 days earlier. How many parts are there in this batch?
加工一批零件，原计划每天加工15个，若干天可以完成．当完成加工任务的(3/5)时，采用新技术，效率提高20%．结果，完成任务的时间提前10天，这批零件共有几个？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">10 / (1/6) / (2/5)</gadget>
<output>150</output>

<gadget id="calculator">15 * 150</gadget>
<output>2_250</output>

<result>2_250</result>