prompt: Marta works on her grandparent's farm to raise money for a new phone. So far, she has collected $240. For every hour she works, she receives $10. Her grandmother often gives her tips, and she has collected $50 in tips in total. How many hours has Marta worked on the farm so far?
messages.content: Marta works on her grandparent's farm to raise money for a new phone. So far, she has collected $240. For every hour she works, she receives $10. Her grandmother often gives her tips, and she has collected $50 in tips in total. How many hours has Marta worked on the farm so far?
messages.role: user
messages.content: Ignoring tips, Marta earned $240 - $50 = $<<240-50=190>>190.
  Therefore, she has worked 190 / 10 = <<190/10=19>>19 hours.
  #### 19
messages.role: assistant