The Guangming Fruit Store sold 420 kg of watermelons last week, and 370 kg of watermelons this week. How many kilograms of watermelons were sold in these two weeks?
光明水果店上星期卖出420千克西瓜，这个星期卖出370千克西瓜，这两个星期一共卖出多少千克西瓜．
<gadget id="calculator">420 + 370</gadget>
<output>790</output>

<result>790</result>