There are 150 students in the sixth grade, including 30 "three good students". What percentage of the number of sixth grade students are "three good students"?
六年级有学生150人，其中"三好学生"有30人．"三好学生"占六年级学生人数的百分之几？
<gadget id="calculator">30 / 150</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>