There are 50 students in a class, 13 of them are rated as "three good students", how many students are not rated in the total number of students?
一个班里有50人，13人评上"三好学生"，没评上的学生占总人数的多少
<gadget id="calculator">50 - 13</gadget>
<output>37</output>

<gadget id="calculator">37 / 50</gadget>
<output>37/50 = around 0.74</output>

<result>37/50 = around 0.74</result>