Using the condition given to build an inequality, it is found that the maximum number of junior high school student he can still recruit is of 17.
<h3>Inequality:</h3>
Considering s the number of senior students and j the number of junior students, and that he cannot recruit more than 50 people, the inequality that models the number of students he can still recruit is:
In this problem:
Already recruited 28 senior high students, hence .
Already recruited 5 junior high students, want to recruit more, hence .
Then:
The maximum number of junior high school student he can still recruit is of 17.