conversations.from: human
conversations.value: Break down this math problem: James buys 20 coins of a cryptocurrency at $15 each.  The value of the coins increases by 2/3.  He sells coins to recoup his original investment.  How many coins did he sell?
conversations.from: assistant
conversations.value: His original investment was 15*20=$300
  The value of his investment increases by 15*2/3=$10 per coin
  So each coin was worth 15+10=$25
  So he sold 300/25=12 coins