30 cows produce a total of 1890 kilograms of milk in 7 days. How many kilograms of milk does each cow produce per day on average?
30头奶牛7天共产奶1890千克，平均每头奶牛每天产奶多少千克？
<gadget id="calculator">1_890 / 30 / 7</gadget>
<output>9</output>

<result>9</result>