When Ma Xiaohu calculated the average score of a test in a group, he mistakenly wrote Li Ming's score of 96 as 69, and the calculated average score was 87. After finding out, he corrected the average score to 90. How many people are there in this group? classmate.
马小虎同学在统计一个小组的一次考试的平均成绩时，将李明同学的得分96误写作69，算出的平均分是87分，发现后将平均分更正为90分，则这个小组有多少位同学．
<gadget id="calculator">96 - 69</gadget>
<output>27</output>

<gadget id="calculator">90 - 87</gadget>
<output>3</output>

<gadget id="calculator">27 / 3</gadget>
<output>9</output>

<result>9</result>