There is a pile of peaches weighing 24.6 kilograms. After selling some, there are 12.1 kilograms left. How many kilograms were sold?
有一堆桃子，重24.6千克，卖掉一些后，还剩下12.1千克，卖掉了多少千克？
<gadget id="calculator">24.6 - 12.1</gadget>
<output>12.5</output>

<result>12.5</result>