Right now, Dr. Johnson is three times older than his son.
When Dr. Johnson was 37 years old, his son was 3 years old.
How old are Dr. Johnson and his son now?
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Answer: Dr. Johnson is 51 and his son is 17 years old.
Assume that Dr. Johnson is X years old and his son is Y years old.
Then 3Y = X, and X – Y = 34.
Solving for X and Y, we get X = 51 and Y = 17.