The First Stationery Factory produced 8,400 gel pens. If 12 gel pens are packed in a box and 70 boxes are packed in a box, how many boxes of these gel pens can be packed?
第一文具厂生产了8400支中性笔，如果12支装一盒，70盒装一箱，这些中性笔可以装多少箱？
<gadget id="calculator">8_400 / 12 / 70</gadget>
<output>10</output>

<result>10</result>