Xiao Ming investigated the brother relationship of the students in this class as follows: students with older brothers account for 55% of the whole class. Students with younger brothers make up 50% of the class. The number of students who have both elder brothers and younger brothers is 25% of the whole class. There are 8 students who have neither elder brother nor younger brother. According to the above data, how many students are there in Xiaoming's class?
小明调查了本班学生的兄弟关系如下：有哥哥的学生是全班学生人数的55%．有弟弟的学生是全班学生人数的50%．既有哥哥，又有弟弟的学生数是全班人数的25%．既没有哥哥，又没有弟弟的学生有8名．根据上面的数据试求小明班上共有学生多少名？
<gadget id="calculator">55 / 100</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/2) - (1/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(11/20) + (1/4)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">8 / (1/5)</gadget>
<output>40</output>

<result>40</result>