conversations.from: human
conversations.value: I would love to understand how to solve this problem: Richard lives in an apartment building with 15 floors. Each floor contains 8 units, and 3/4 of the building is occupied. What's the total number of unoccupied units In the building?
  Can you explain?
conversations.from: assistant
conversations.value: The total number of units in the building will be 8 units/floor * 15 floors = 120 units.
  If 3/4 of the building is occupied, then the total number of occupied units is 3/4 * 120 units = 90 units.
  The total number of unoccupied units is 120 units - 90 units = 30 units.