conversations.from: human
conversations.value: Out of the 400 emails that Antonia received in her mail, 1/4 were spam emails, while 2/5 of the remaining emails were promotional messages. If the rest of the emails were important emails, calculate the total number of important emails in her inbox.
  How to solve this?
conversations.from: assistant
conversations.value: Out of the 400 emails, 1/4*400 = 100 emails were spam emails.
  The number of emails that were not spam emails is 400-100 = 300
  2/5 of the emails which were not spam were promotional emails, a total of 2/5*300=120 emails.
  If the rest of the emails were important emails, there were 300-120 = 180 important emails.