The sum of the present ages of a father and his son is 36 years. Three years ago, father's age was five times the age of the son. After 3 years, son's age will be:
Explanation:
Let the present ages of son and father be x and (36 - x) years respectively.
Three years ago, father's age was five times the age of the son.
∴ (36 - x) - 3 = 5(x - 3)
⇒ 33 - x = 5x - 15
⇒ 6x = 48
⇒ x = 8.
∴ Son's age after 3 years = (x + 3) = 11 years.
Hence, option (d).
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