conversations.from: human
conversations.value: In a school with 800 students, 5/8 of the students are girls. Seven-tenths of the girls and two-fifths of the boys are in the primary grades, while the rest are middle schoolers. How many middle schoolers are there?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: There are 800 x 5/8 = 500 girls.
  So, there are 800 - 500 = 300 boys.
  There are 500 x 7/10 = 350 girls that are in the primary grades.
  Hence, 500 - 350 = 150 girls are middle schoolers.
  There are 300 x 2/5 = 120 boys that are in the primary grades.
  Hence, 300 - 120 = 180 boy students are middle schoolers.
  Therefore, a total of 150 girls + 180 boys = 330 middle schoolers.