In a classroom, there are 25 students. If 16 students have brown eyes and the rest have blue eyes, what fraction of the students have blue eyes?
The fraction is 9/25.

Here's the reasoning:

1. First, let's find out how many students have blue eyes: 25 students - 16 students with brown eyes = 9 students with blue eyes.
2. Now, to calculate the fraction of students with blue eyes, we need to divide the number of students with blue eyes by the total number of students: 9 / 25.
3. Therefore, the fraction of students with blue eyes is 9/25.