conversations.from: human
conversations.value: Explain how to solve this math problem: If there were 200 students who passed an English course three years ago, and each subsequent year until the current one that number increased by 50% of the previous year's number, how many students will pass the course this year?
conversations.from: assistant
conversations.value: We begin 3 years ago with 200 students, and moving forward to two years ago we find there were 200*1.5= 300 students who passed.
  At the end of the subsequent year 50% more students pass than last year's 300, so that means 300*1.5=450 students pass.
  At the end of the current year there's another 50% increase over the previous year, meaning we have 450*1.5= 675 students pass.