conversations.from: human
conversations.value: Emma can make and upload 72 vlogs per month. But she was only able to make 18 vlogs for the first week, 21 vlogs for the second week, and 15 vlogs for the third week. How many vlogs should she do to complete the 72 vlogs per month?
conversations.from: assistant
conversations.value: Emma was able to make 18 + 21 + 15 = 54 vlogs for 3 weeks.
  Therefore, Emma needs to do 72 - 54 = 18 more vlogs to complete the 72 vlogs.