There are 120 students in the sixth grade, boys accounted for (9/20), how many girls are there?
六年级共有学生120人，男生占(9/20)，女生有多少人？
<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">120 * (11/20)</gadget>
<output>66</output>

<result>66</result>