Give the step-by-step reasoning process and then the final answer. 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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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.
The final answer: 12.
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