The livestock farm has 300 cows. A total of 9,000 kilograms of grass were eaten in six days. How many kilograms of grass does each cow graze on average in six days?
畜牧场养了300头奶牛．六天共吃草9000千克．平均每头奶牛六天吃草多少千克？
<gadget id="calculator">9_000 / 300</gadget>
<output>30</output>

<result>30</result>