There are 45 students in Class 51, including 25 boys. How many boys account for the whole class?
五1班有45人，其中男生25人，男生人数占全班人数的多少．
<gadget id="calculator">25 / 45</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>