The aluminum factory originally planned to produce 126 tons of aluminum per year, but actually produced 21,000 tons more than planned every month. How many months did it take to complete the annual task?
铝厂原计划全年产铝126吨，实际每月比计划多产2.1万吨，实际几个月完成全年任务？
<gadget id="calculator">126 / 12</gadget>
<output>21/2 = around 10.5</output>

<gadget id="calculator">(21/2) + 2.1</gadget>
<output>12.6</output>

<gadget id="calculator">126 / 12.6</gadget>
<output>10</output>

<result>10</result>