A basket of wheat weighs 40.5 kilograms in total. After taking out half of the basket, there is still 21.5 kilograms in the basket. How much does the basket weigh?
一筐小麦，连筐称共重40.5千克，取出一半后，连筐还有21.5千克，筐重多少千克？
<gadget id="calculator">40.5 - 21.5</gadget>
<output>19</output>

<gadget id="calculator">21.5 - 19</gadget>
<output>2.5</output>

<result>2.5</result>