conversations.from: human
conversations.value: Adam teaches 50 students a year. How many students will Adam teach in 10 years if in the first year he only teaches 40 students?
  Solve it.
conversations.from: assistant
conversations.value: Adam will teach 50 * 9 = 450 students in 9 years.
  So, in 10 year Adam will teach 450 + 40 = 490 students.