The fruit supermarket originally had 3,400 kilograms of watermelons. After selling 3,000 kilograms, another 5,000 kilograms were shipped in. How many kilograms of watermelon are there now?
水果超市原有西瓜3400千克，卖出3000千克后，又运来5000千克．现在有西瓜多少千克？
<gadget id="calculator">3_400 - 3_000</gadget>
<output>400</output>

<gadget id="calculator">400 + 5_000</gadget>
<output>5_400</output>

<result>5_400</result>