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    Question

    Arjun is three years senior to Binny, who is twice as

    old as Chinu. If the average age of Arjun, Binny, and Chinu is 21 years, what is the age difference between Binny and Chinu?
    A 25 yrs Correct Answer Incorrect Answer
    B 18 yrs Correct Answer Incorrect Answer
    C 15 yrs Correct Answer Incorrect Answer
    D 12 yrs Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    Total age of Arjun, Binny and Chinu = 21 × 3 = 63 years Let the age of Chinu be‘c’ years Age of Binny = ‘2c’ years Age of Arjun = ‘2c + 3’ years According to the question, 2c + 3 + 2c + c = 63 5c + 3 = 63 5c = 60 c = 12 Age of Binny = 24 years Age of Chinu = 12 years Required difference = 24 – 12 = 12 years

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