The store sold 256 kilograms of apples yesterday, and twice as many apples were sold today. How many kilograms of apples were sold today?
商店昨天卖出256千克苹果，今天卖出苹果的数量是昨天的2倍，今天卖出多少千克苹果？
<gadget id="calculator">256 * 2</gadget>
<output>512</output>

<result>512</result>