conversations.from: human
conversations.value: The building has 42 storage units that are a total of 5040 square feet. Twenty of the units are 8 by 4 feet each. If the remaining units are all the same size, what is the area, in square feet, for one of the remaining units?
conversations.from: assistant
conversations.value: 8 * 4 = 32 square feet
  20 * 32 = 640 square feet
  5040 - 640 = 4400 square feet
  There are 42 - 20 = 22 remaining units
  4400/22 = 200 square feet
  One of the remaining units is 200 square feet.