A basket of apples weighs 25.5 kilograms. After half of the apples are sold, 13.5 kilograms remain. How much does the basket weigh?
一筐苹果连筐重25.5千克，卖掉一半后，还剩13.5千克，请问筐重多少千克？
<gadget id="calculator">25.5 - 13.5</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">25.5 - 24</gadget>
<output>1.5</output>

<result>1.5</result>