question: Betsy and Donovan made a meal together. Betsy's part took 18 minutes longer than Donovan's part. The meal was made in 98 minutes. How many minutes long was Betsy's part?
answer: Let D = Donovan's time in minutes
  Betsy = D + <<+18=18>>18
  2D + 18 = 98
  2D = 80
  D = <<40=40>>40
  Betsy = 40 + 18 = <<40+18=58>>58 minutes
  Betsy's part took 58 minutes.
  #### 58