My question is: 9 years from now, John will be 3 times as old as he was 11 years ago. How old is he now? Your thoughts:
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Let J represent John’s age. We have J + 9 = 3(j − 11). So, J + 9 = 3J − 33. So, 9 = 2J − 33. So, 42 = 2J. Which means that John’s age is J = 42 / 2 = 21. The final answer: 21.
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