conversations.from: human
conversations.value: I need a clearer understanding of how to solve: Three years from now, Tully will be twice as old as Kate. How old was Tully a year ago if Kate is now 29 years old?
conversations.from: assistant
conversations.value: Three years from now, Kate will be 29 years + 3 years = 32 years old.
  So by that time, Tully will be 32 years x 2 = 64 years old.
  This means, Tully is 64 years - 3 years = 61 years old now.
  Therefore, Tully was 61 years - 1 year = 60 years old last year.