A parts processing factory has 34 old workers and 102 new workers. An old worker processes 24 parts per day, and a new worker processes 18 parts per day. Now a total of 21,216 parts are processed. How many days will it take to complete the task?
一个零件加工厂有34名老工人和102名新工人．一名老工人每天加工零件24个，一名新工人每天加工零件18个．现在共加工零件21216个．需要多少天才能完成任务？
<gadget id="calculator">24 * 34</gadget>
<output>816</output>

<gadget id="calculator">18 * 102</gadget>
<output>1_836</output>

<gadget id="calculator">816 + 1_836</gadget>
<output>2_652</output>

<gadget id="calculator">21_216 / 2_652</gadget>
<output>8</output>

<result>8</result>