Dongfeng Tractor Factory manufactured 2,640 tractors in the first half of the year, and how many tractors were manufactured on average per month.
东风拖拉机厂上半年制造了2640台拖拉机，平均每月制造多少台．
<gadget id="calculator">2_640 / 6</gadget>
<output>440</output>

<result>440</result>