A father is thrice as old as his younger son. 25 years ago, the age of the father was 13 times the age of the son. The present age of the father (in years) is

90

62

58

45

Let younger son's age = x. Then father's age = 3x 13 (x - 25) = (3x - 25) 10x = 300 x = 30 Father's present age = 90 years.

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