prompt: John uses a 75-watt electric fan for 8 hours a day. How much kWh of electric energy does he consume per month (30 days) for using the electric fan?
messages.content: John uses a 75-watt electric fan for 8 hours a day. How much kWh of electric energy does he consume per month (30 days) for using the electric fan?
messages.role: user
messages.content: In a day, John uses 75x 8 = <<75*8=600>>600 watts.
  So in a month, he uses 600 x 30 = 18 000 watts.
  Since there are 1000 watts in 1 kilowatt, then John uses 18000/1000 = <<18000/1000=18>>18.
  #### 18
messages.role: assistant