A father is 30 years elder than his son. In 12 years, the man's age will be 3 times as old as his son. Find their present age.
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Solution:- Let the present age of the son be 'x' years. Then father's age will be (x + 30) years Given : After 12 years, the father will be three times as old as his son. Therefore, (x + 12)×3 = x + 30 + 12 3x + 36 = x + 42 3x - x = 42 - 36 2x = 6 x = 3 The present age of son is 3 years and the present age of the father is 3 + 30 = 33 years.