There are 45 students in the third class of the fourth year, including 24 girls. What percentage of the total number of boys are in the class?
四年三班有学生45人，其中女生24人，男生占全班总人数的几分之几？
<gadget id="calculator">45 - 24</gadget>
<output>21</output>

<gadget id="calculator">21 / 45</gadget>
<output>7/15 = around 0.466667</output>

<result>7/15 = around 0.466667</result>