conversations.from: human
conversations.value: Solve the math problem: Musa is the class teacher of a class of 45 students. He wants to split them into three groups by age. If a third of the class is under 11 years, and two-fifths are above 11 but under 13, how many students will be in the third group (13 years and above)?
conversations.from: assistant
conversations.value: The first group is a third of the class which is (1/3)*45 = 15 students
  There are 15 students in the first group, so there are 45-15 = 30 students
  The second group is two-fifths of the class which is (2/5)*45 = 18 students
  There are 18 in the second group so there are 30-18 = 12 students left in the third group