conversations.from: human
conversations.value: Kat gets a 95% on her first math test and an 80% on her second math test. If she wants an average grade of at least 90% in her math class, what does she need to get on her third final math test?
  Give me a detailed solution.
conversations.from: assistant
conversations.value: Let x = the percent needed on her third math test
  (95 + 80 + x)/3 = 90
  (95 + 80 + x) = 270
  x = 270 - 95 - 80
  x = 95