Question

    Average age of 8 boys is increased by 3 years when two

    of them whose age are 20 and 24 years are replaced by two new members. What is the average age of the new member?
    A 34 Correct Answer Incorrect Answer
    B 25 Correct Answer Incorrect Answer
    C 50 Correct Answer Incorrect Answer
    D 48 Correct Answer Incorrect Answer

    Solution

    Let the sum of the age of two new members be ‘a’. Let the initial average age of boys = x  After increment the average age of boys = x + 3 According to question,  => 8x – 20 – 24 + a = 8(x+3) => a = 68 Average age of the new members = 68/2 = 34

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