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SSC Quantitative Aptitude Average Question Bank Average (I)

  • question_answer
    The average age of 24 boys and their teacher is 15 yr. When the teacher's age is excluded, the average age decreases by 1 yr. The age of the teacher is

    A) 38 yr

    B) 39 yr

    C) 40 yr

    D) 41 yr

    Correct Answer: B

    Solution :

    [b] Sum of the ages of 24 boys and 1 teacher \[=(15\times 25)yr=375yr\] Sum of the ages of 24 boys \[=(24\times 14)yr=336yr\] Age of the teacher \[=(375-336)yr=39yr\]


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