There are 40 students in a class, 23 girls, how many boys account for the whole class
一班有学生40人，女生23人，男生占全班人数的多少
<gadget id="calculator">40 - 23</gadget>
<output>17</output>

<gadget id="calculator">17 / 40</gadget>
<output>17/40 = around 0.425</output>

<result>17/40 = around 0.425</result>