conversations.from: human
conversations.value: Mark and Peter dug ponds in their backyards. Mark’s pond is 4 feet deeper than 3 times Peter’s pond. If Mark’s pond is 19 feet deep, what is the depth of Peter’s pond?
conversations.from: assistant
conversations.value: Let’s use p for the number of feet in Mark’s pond
  3*p+4=19
  3*p=19-4=15
  3p=15
  p=5