Dr. Johnson is 54 years old and his father is 80 years old. How many years ago was Dr. Johnson’s father three times Dr. Johnson’s age?

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Answer: 41 years ago.
Let Y be the number of years we are looking for. Then we have the following equation:
(54 – Y) x 3 = 80 – Y. Solving for Y, we get Y = 41. So 41 years ago Dr. Johnson was 13 and his father was 39 (13 x 3 = 39).

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