conversations.from: human
conversations.value: Amon & Rhonda combined have 215 marbles. If Amon owns 55 marbles more than Rhonda, how many marbles does Rhonda have?
  Give me a clear explanation.
conversations.from: assistant
conversations.value: Let's say Rhonda has m marbles.
  The total number of marbles that Ammon has is m+55
  Amon & Rhonda combined have m+(m+55) = 215
  This means the total number of marbles they have together is 2m+55 = 215
  2m=215-55
  The total number of marbles that Rhonda has is m=160/2
  Rhonda has m=80 marbles.