The weight of a watermelon is equal to 2 kilograms plus the weight of half a watermelon. How much does this watermelon weigh in kilograms?
一只西瓜的重量等于2千克加上半个西瓜的重量，这个西瓜重多少千克．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<result>4</result>