His original investment was 15*20=$<<15*20=300>>300

The value of his investment increases by 15*2/3=$<<15*2/3=10>>10 per coin

So each coin was worth 15+10=$<<15+10=25>>25

So he sold 300/25=<<300/25=12>>12 coins

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
12
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?
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