Explanation:
this is very roughly converted from the original question, I bet. no punctuation marks and, and ...
what I understood of the important information is :
there are 23 boxes of books with 12 books in each.
there are 4 teachers dividing the books evenly among themselves for their cells (classes ?) of students.
so, we need to divide the books by 4 to distribute them evenly into 4 parts.
23×12/4 = 23×3 = 69
each teacher got 69 books.