There are 42 students in a class, of which there are 24 boys, how many girls account for the whole class.
一个班有42名学生，其中男生有24人，女生占全班人数的多少．
<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>