conversations.from: human
conversations.value: Solve the following math problem: The cost of Joe's new HVAC system is $20,000.  It includes 2 conditioning zones, each with 5 vents.  In dollars, what is the cost of the system per vent?
conversations.from: assistant
conversations.value: Two zones with 5 vents per zone is 2*5=10 vents.
  Thus, the $20,000 system costs $20,000/10 = $2,000 per vent.