Dad bought 3 kilograms of watermelon and 4000 grams of apples. How many grams of fruit did he buy in total?
爸爸买了3千克西瓜和4000克苹果，一共买了多少克水果？
<gadget id="calculator">4_000 / 1_000</gadget>
<output>4</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<result>7</result>