There are 840 aircraft models in the school, every 4 are packed in a box, and every 6 boxes are packed in a box, how many boxes can it hold?
学校有840个飞机模型，每4个装一盒，每6盒装一箱，能装多少箱？
<gadget id="calculator">840 / 4 / 6</gadget>
<output>35</output>

<result>35</result>