To produce a batch of parts, the master alone needs 10 hours to complete, while the apprentice can make 40 parts per hour. Now the master and apprentice work together. When the task is completed, the ratio of the number of parts produced by the master and apprentice is 3:2. How many parts are there in total?
生产一批零件，师傅独做要10小时完成，徒弟每小时可以做40个．现在师徒二人一起做，完成任务时，师徒两人生产零件数量的比是3：2．这批零件一共有多少个？
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">10 * (3/2)</gadget>
<output>15</output>

<gadget id="calculator">15 * 40</gadget>
<output>600</output>

<result>600</result>