Two machines, A and B, produce a batch of parts at the same time, and it takes 36 hours to complete. A produces 120 per hour and B produces 150 per hour. How many parts are there in this batch?
甲乙两台机器同时生产一批零件，36小时完成．甲每小时生产120个，乙每小时生产150个．这批零件有多少个？
<gadget id="calculator">120 + 150</gadget>
<output>270</output>

<gadget id="calculator">270 * 36</gadget>
<output>9_720</output>

<result>9_720</result>