On the first day of school, Mrs. McGillicuddy had 25 students registered for the morning session of kindergarten, but 3 students were absent; and she had 24 students registered for the afternoon session, but 4 students were absent. How many students did Mrs. McGillicuddy have over the two kindergarten sessions? Let's think first. Chain of thought:
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25 - 3 = 22 students. 24 - 4 = 20 students. She had 22 + 20 = 42 students.
Therefore, the answer is 42.
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