20 dairy cows produce 420 kilograms of milk in one week, how many kilograms of milk does each cow produce on average per day?
20只奶牛1个星期产奶420千克，平均每只奶牛每天产奶多少千克？
<gadget id="calculator">420 / 20 / 7</gadget>
<output>3</output>

<result>3</result>