Master Zhang makes 18 parts per hour, and Master Wang makes 20 parts per hour. The two cooperated and completed a batch of parts processing tasks in 6 hours. How many parts are there in this batch?
张师傅每小时做18个零件，王师傅每小时做20个零件．两人合作，6小时完成了一批零件加工任务，这批零件有多少个？
<gadget id="calculator">18 + 20</gadget>
<output>38</output>

<gadget id="calculator">38 * 6</gadget>
<output>228</output>

<result>228</result>