conversations.from: human
conversations.value: Solve the math problem: 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?
conversations.from: assistant
conversations.value: In a day, John uses 75x 8 = 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 = 18.