Answer:
30 students
Explanation:
Let's use algebra to solve this problem.
Let "x" represent the total number of students in Mr. Albert's class.
We are given that one-tenth of the students had perfect attendance, and we know that 3 students had perfect attendance.
So, we can write the equation:

Now, to find the total number of students (x), we can solve for x by multiplying both sides of the equation by 10:


So, there are 30 students in Mr. Albert's class.