The school cafeteria bought 30.25 kilograms of tomatoes, 12.07 kilograms of cucumbers, and 3.91 kilograms less celery than the sum of tomatoes and cucumbers. How many kilograms of celery were bought?
学校食堂买来西红柿30.25千克，黄瓜12.07千克，买来的芹菜比西红柿和黄瓜的总和少3.91千克，买来芹菜多少千克？
<gadget id="calculator">12.07 - 3.91</gadget>
<output>8.16</output>

<gadget id="calculator">30.25 + 8.16</gadget>
<output>38.41</output>

<result>38.41</result>