prompt: Together Felipe and Emilio needed a combined time of 7.5 years to build their homes. Felipe finished in half the time of Emilio. How many months did it take Felipe to build his house?
messages.content: Together Felipe and Emilio needed a combined time of 7.5 years to build their homes. Felipe finished in half the time of Emilio. How many months did it take Felipe to build his house?
messages.role: user
messages.content: Let F = the number of years Felipe needed to build his house
  Emilio = <<2=2>>2F
  3F = 7.5 years
  F = <<2.5=2.5>>2.5 years
  2.5 years = 30 months
  It took Felipe 30 months to build his house.
  #### 30
messages.role: assistant