Class 501 has 42 students, including 25 boys. What percentage of the whole class is the number of girls?
501班有学生42人，其中男生有25人，女生人数是全班的几分之几？
<gadget id="calculator">42 - 25</gadget>
<output>17</output>

<gadget id="calculator">17 / 42</gadget>
<output>17/42 = around 0.404762</output>

<result>17/42 = around 0.404762</result>