###Human: 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?, ### Assistant: 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 
 So the answer is :  12