There are 42 students in Class 1 of the fifth grade, 24 boys, boys account for the total number ((())/(())), and girls are boys ((())/(())).
五年级一班有学生42人，男生24人，男生占总人数的((())/(()))，女生是男生的((())/(()))．
<gadget id="calculator">42 - 24</gadget>
<output>18</output>

<gadget id="calculator">18 / 24</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>