The store originally had 409 kilograms of apples. After selling some, there are 199 kilograms left. How many kilograms of apples are sold?
商店原有409千克苹果，卖出一些后，还剩下199千克，卖出多少千克苹果？
<gadget id="calculator">409 - 199</gadget>
<output>210</output>

<result>210</result>