Two masters and apprentices process a batch of parts. The master can process 125 parts in 5 hours, and the apprentice can process 20 parts per hour. The two work at the same time in 6 hours to complete the task. How many parts are there in total?
师徒两人加工一批零件，师傅5小时能加工125个零件，徒弟每小时加工20个零件，两人同时加工6时正好完成任务．这批零件一共有多少个？
<gadget id="calculator">125 / 5</gadget>
<output>25</output>

<gadget id="calculator">25 + 20</gadget>
<output>45</output>

<gadget id="calculator">45 * 6</gadget>
<output>270</output>

<result>270</result>