Aunt Zhang packed a basket of vegetables and sold them at the farmer’s market. Before selling, the total weight of the basket and vegetables was 7.4 kg. After selling some vegetables, the total weight of the basket and vegetables was 3.6 kg. How many kilograms of vegetables did she sell?
张阿姨装了一篮菜去农贸市场卖，卖前称得篮和菜的总质量为7.4千克，卖一些菜后，称得篮和菜的总质量为3.6千克．她卖出了多少千克菜？
<gadget id="calculator">7.4 - 3.6</gadget>
<output>3.8</output>

<result>3.8</result>