There are 4 cowsheds in the dairy farm, and each cowshed has only 8 cows. The dairy farm needs to feed 640 kilograms of feed a day. How many kilograms of feed is fed to each cow on average?
奶牛场有4个牛棚，每个牛棚只有8头奶牛，奶牛场一天要喂饲料640千克，平均每头喂饲料多少千克？
<gadget id="calculator">4 * 8</gadget>
<output>32</output>

<gadget id="calculator">640 / 32</gadget>
<output>20</output>

<result>20</result>