There are 25 boys in Class 1, which is 11 fewer than twice the number of girls. How many girls are there?
五一班有男生25人，比女生的2倍少11人，女生几人？
<gadget id="calculator">25 + 11</gadget>
<output>36</output>

<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<result>18</result>