conversations.from: human
conversations.value: Three people divided an amount of $1920. The second took $80 more than the first and the third took twice what the second took. Calculate the share of the first one.
  Give me a clear explanation.
conversations.from: assistant
conversations.value: Let X be the amount of what the first took.
  The second took X+80.
  The third took (X+80)*2.
  The total amount X + (X+80) + (X+80)*2 = 1920.
  X + X + 80 + 2*X + 80*2 = 1920
  X*4 + 240 = 1920.
  X*4 = 1680.
  X = 420.