There are 640 boxes of mineral water, half of which have already been transported, and the rest will be transported by 8 vehicles at a time. How many boxes are transported by each vehicle on average?
有640箱矿泉水，已经运走了一半，剩下的由8辆车一次来运，平均每辆车运多少箱？
<gadget id="calculator">640 / 2 / 8</gadget>
<output>40</output>

<result>40</result>