A teacher divides the students in her class into even discussion groups,
How many students are in the class?
Let's solve this problem step by step.
- Step 1: As defined by the problem, the total number of students in the class needs to be an even number.
- Step 2: According to simple divisibility rules, an even number ends in 0, 2, 4, 6, or 8. We apply this rule to the answer choices.
- Step 3: The answer choices are:
- 41, which is odd.
- 31, which is odd.
- 21, which is odd.
- 22, which ends in 2 and is even.
- Conclusion: The only even number among the choices is 22.
Therefore, the correct answer is 22.