There are 49 students in Class 1, including 28 boys, and men account for the whole class ((())/(())).
四1班一共有学生49人，其中男生有28人，男人占全班人数的((())/(()))．
<gadget id="calculator">28 / 49</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>