There are 420 kilograms of strawberries in the fruit shop of Auchan supermarket. For the convenience of storage, each 2 kg is packed in a bag, and every 7 bags are packed in a box. How many boxes should the fruit shop prepare in total?
欧尚超市水果铺有420千克草莓，为了便于保存，每2千克装一袋，每7袋装一箱，水果铺一共要准备多少个箱子？
<gadget id="calculator">420 / 2 / 7</gadget>
<output>30</output>

<result>30</result>