conversations.from: human
conversations.value: There are 381 pages in Elliot’s book.  He has already read 149 pages.  If he reads 20 pages a day for a week, how many pages are still left to be read?
  Solve it.
conversations.from: assistant
conversations.value: In a week, Elliot will read 20 x 7 = 140 pages.
  Adding the prior readings, he has read a total of 149 + 140 = 289 pages.
  There are 381 - 289 = 92 pages still left to be read.