A and B each process the same number of parts and process them at the same time. When A completes the task, B still has 150 unfinished parts. When B completes the task, A can overcomplete 250 parts. How many parts are there in this batch?
甲、乙两人各加工同样多的零件，同时加工，当甲完成任务时，乙还有150个没有完成，当乙完成任务时，甲可以超额完成250个，这批零件有多少个？
<gadget id="calculator">375 * 2</gadget>
<output>750</output>

<result>750</result>