New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    In a family, the mother is 3 years younger than the father

    and three times as old as the daughter. If their combined age is 84 years, how many years later will the father be twice as old as the daughter?
    A 25 yrs Correct Answer Incorrect Answer
    B 14 yrs Correct Answer Incorrect Answer
    C 17 yrs Correct Answer Incorrect Answer
    D 10 yrs Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the present age of the daughter and the mother be 'x' years and '3x' years, respectively.

    Then, present age of the father = (3x + 3) years

    So, x + 3x + (3x + 3) = 84

    Or, 7x + 3 = 84

    So, x = (84 - 3) ÷ 7 = 11

    Present ages of the daughter and father are 11 years and 36 years, respectively.

    For some 'y',

    (11 + y) × 2 = (36 + y)

    Or, 22 + 2y = 36 + y

    So, y = 14

    14 years hence from now, the father will be twice as old as the daughter.

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