The master and apprentice worked together to process a batch of parts. The master paid for processing 27 pieces per hour, and the apprentice processed 23 pieces per hour. The apprentice started working after one hour of the teacher’s payment for processing, and it took another 2.4 hours to complete the task. How many parts are there in this batch? indivual?
师徒二人共同加工一批零件，师付每小时加工27个，徒弟每小时加工23个，师付加工1小时后徒弟才开始工作，又用了2.4小时完成了任务，这批零件有多少个？
<gadget id="calculator">27 + 23</gadget>
<output>50</output>

<gadget id="calculator">50 * 2.4</gadget>
<output>120</output>

<gadget id="calculator">27 + 120</gadget>
<output>147</output>

<result>147</result>