conversations.from: human
conversations.value: This math problem has got me stumped: At a certain school, 2/3 of the population are females. One-tenth of the males are foreign students. If the school has 300 students, how many students are non-foreign male students?
  Can you show me the way?
conversations.from: assistant
conversations.value: There are 300 x 2/3 = 200 females in the school.
  So, 300 - 200 = 100 are males.
  Out of the 100 males, 100 x 1/10 = 10 are male foreign students.
  Thus, there are 100 - 10 = 90 non-foreign male students.