There are 23 boys and 21 girls in Class 5 and 4. Among them, there are 31 students who are good students. What percentage of the total number of students are good students?
五4班有男生23人，女生21人，其中三好学生有31人，三好学生的人数占全班人数的几分之几？
<gadget id="calculator">31 / 45</gadget>
<output>31/45 = around 0.688889</output>

<result>31/45 = around 0.688889</result>