conversations.from: human
conversations.value: This math problem has got me stumped: Jeff is 10 years older than his younger sister, Martha. Martha, on the other hand, is 4 years younger than her boyfriend, Mike. If Mike is 24 years old, how old is Jeff?
  Can you show me the way?
conversations.from: assistant
conversations.value: Martha is 24 - 4 = 20 years old.
  Jeff is 20 + 10 =30 years old.