The school cafeteria shipped 1,800 kilograms of rice, and after eating for 4 days, there was still 400 kilograms left. How many kilograms do you eat on average per day?
学校食堂运来大米1800千克，吃了4天后，还剩400千克．平均每天吃多少千克？
<gadget id="calculator">1_800 - 400</gadget>
<output>1_400</output>

<gadget id="calculator">1_400 / 4</gadget>
<output>350</output>

<result>350</result>