## Task 1 - 080621

In a 6th grade class, no student received a final grade of 5 in mathematics, every ninth student received a grade of 1, every third student received a grade of 2, and every sixth student received a grade of 4.

The number of students $n$ in this class is known to be: $20<n<40$.

Calculate the number of students who received a final grade of 3!
The total number of students $n$ must be a multiple of the numbers 3, 6, and 9, and at the same time satisfy the condition $20<n<40$. This is only true for the number 36. $\frac{1}{9}$ of 36 is $4, \frac{1}{3}$ of 36 is $12, \frac{1}{6}$ of 36 is 6.

In total, 22 students received either a grade of 1, 2, or 4. Therefore, 14 students achieved a grade of 3, since the difference between 36 and 22 is 14.