There are 42 students in Class 51, including 24 boys, how many girls account for the whole class.
五1班有学生42人，其中男生有24人，女生占全班的多少．
<gadget id="calculator">42 - 24</gadget>
<output>18</output>

<gadget id="calculator">18 / 42</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>