The sports equipment factory produces 6,800 table tennis balls, each of which is packed in a bag of 25, and packed in a box of four bags. How many boxes do I need?
体育器材厂生产6800个乒乓球，每25个装一袋，每4袋装一箱．需要准备多少个箱子？
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<gadget id="calculator">6_800 / 100</gadget>
<output>68</output>

<result>68</result>