Want Want Supermarket brings in 420 durians, each with 6 bags in one bag and 7 bags in one box. How many boxes should be prepared in total?
旺旺超市运进420个榴莲，每6个装一袋，7袋装一箱，一共要准备多少个箱子？
<gadget id="calculator">6 * 7</gadget>
<output>42</output>

<gadget id="calculator">420 / 42</gadget>
<output>10</output>

<result>10</result>