My question is: 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? Your thoughts:
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.