conversations.from: human
conversations.value: James turned 23 the same time John turned 35.  Tim is 5 years less than twice John's age.  If Tim is 79 how old is James?
  Solve it.
conversations.from: assistant
conversations.value: James is 35-23=12 years younger than John
  5 years less than Tim's age is 79-5=74 years old
  So John is 74/2=37 years old
  That means James is 37-12=25 years old