The school ordered 720 bags of milk in total, 15 bags in each box, and 4 boxes in a box. How many boxes did you order in total?
学校一共订了720袋牛奶，每盒装15袋，4盒装一箱．一共订了多少箱？
<gadget id="calculator">720 / 15 / 4</gadget>
<output>12</output>

<result>12</result>