There is a problem with this question. if 15 students is 92% of the class, the total class size is therefore N=15*(100/92) = 16.3, or 16 students (to the nearest integer).
So far so good.
However, if we check back, 15 students out of 16 is 15/16*100%=93.75%, nowhere near 92%. I have no idea where the 92% came from, and hence I doubt if there might not be a typo, by the submitting user, or the teacher.
