There are 640 kilograms of rice in the school cafeteria. After 5 days of eating, there are 200 kilograms left. How many kilograms are eaten per day on average?
学校食堂有640千克大米，吃了5天后，还剩200千克，平均每天吃多少千克？
<gadget id="calculator">640 - 200</gadget>
<output>440</output>

<gadget id="calculator">440 / 5</gadget>
<output>88</output>

<result>88</result>