There are 180 students in the sixth grade, including 27 "three good students". What percentage of the number of sixth grade students are "three good students"?
六年级有学生180人，其中"三好生"有27人．"三好生"占六年级学生人数的百分之几？
<gadget id="calculator">27 / 180</gadget>
<output>3/20 = around 0.15</output>

<result>3/20 = around 0.15</result>