conversations.from: human
conversations.value: 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?
  Can you solve this problem?
conversations.from: assistant
conversations.value: 25-3=22 students
  24-4=20 students
  She had 22+20=42 students