There are 36 students in class one of the fifth grade, including 20 boys and how many girls account for the whole class.
五年级一班有36人，其中男生20人，女生占全班的多少．
<gadget id="calculator">36 - 20</gadget>
<output>16</output>

<gadget id="calculator">16 / 36</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>