40 story books and 36 science books were distributed to a group of students. In order to make each person have the same number of books of each type, two story books were missing and one science book was added. How many students in this group people?
40本故事书和36本科技书发给一组同学看，为了使每人每种书的本数一样多，结果故事书少了两本，而科技书多了一本，这一组同学有多少人？
<result>7</result>