In a mathematics competition, the total average score of the award-winning students in a certain school was 80 points. Among them, 8 students who won the first prize have an average score of 95 points, 2 students who have won the third prize have an average score of 70 points, and the rest of the students have won the second prize with an average score of 75 points. How many students won the second prize?
一次数学竞赛中，某校获奖同学的总平均分为80分．其中8名获一等奖的同学的平均分为95分，有2名获三等奖同学的平均分为70分，其余的同学获二等奖，平均分为75分，该校这次竞赛中获二等奖的同学的人数有多少？
<gadget id="calculator">95 * 8</gadget>
<output>760</output>

<gadget id="calculator">70 * 2</gadget>
<output>140</output>

<gadget id="calculator">8 * 80</gadget>
<output>640</output>

<gadget id="calculator">2 * 80</gadget>
<output>160</output>

<gadget id="calculator">140 - 640 - 160</gadget>
<output>-660</output>

<gadget id="calculator">760 + (-660)</gadget>
<output>100</output>

<gadget id="calculator">80 - 75</gadget>
<output>5</output>

<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<result>20</result>