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?
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?
Answer: 41 years ago.
Let N be the needed number of years. Then we have 3x(54-N)=80-N. Solving for N, we get 41.
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