The vegetable store shipped 600 Chinese cabbages, sold 400 kilograms in the morning, and sold out in the afternoon. How many kilograms of Chinese cabbage did you sell in the afternoon?
菜店运来600大白菜，上午卖出400千克，下午全部卖完．下午卖出大白菜多少千克？
<gadget id="calculator">600 - 400</gadget>
<output>200</output>

<result>200</result>