conversations.from: human
conversations.value: I'm completely lost with this math problem: Mr. Sean has a veterinary clinic where he charges clients $60 to treat a dog and $40 to care for a cat. If Khalil took 20 dogs and 60 cats to the clinic for treatment, how much money did he pay Mr. Sean?
  Can you give me a hand?
conversations.from: assistant
conversations.value: To treat his 20 dogs, Mr. Sean charged Khalil 20*$60 = $1200
  Khalil also paid $40*60 = $2400 to Mr. Sean to treat his cats.
  Altogether, Khalil paid Mr. Sean $2400+$1200 = $3600 to treat his pets.