There are 50 students in Class 51, including 30 boys. What percentage of the whole class are boys?
五一班有学生50人，其中男生30人，男生占全班人数的几分之几？
<gadget id="calculator">30 / 50</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>