After half of the 400 kilograms of apples are sold, another 100 kilograms are shipped in. How many kilograms are there at this time?
400千克的苹果卖出一半后，又运来100千克，此时还有多少千克？
<gadget id="calculator">400 / 2</gadget>
<output>200</output>

<gadget id="calculator">200 + 100</gadget>
<output>300</output>

<result>300</result>