To produce a batch of parts, A alone needs 6 hours, and B can make 30 parts per hour. Now A and B are working together. When the task is completed, the ratio of the number of parts produced by A and B is 3:2. How many parts are there in total?
生产一批零件，甲独做要6小时，乙每小时可做30个．现甲乙两人合做，完成任务时，甲乙两人生产零件数量的比是3：2．这批零件一共有几个？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">30 / (2/3)</gadget>
<output>45</output>

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

<result>270</result>