Brain Teaser

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?

See the answer

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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