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SSC Quantitative Aptitude Average Question Bank Average (II)

  • question_answer
    The average age of 40 students of a class is 15 yr. When 10 new students are admitted, the average age is increased by 0.2 yr. The average age of the new students is

    A) 15.2 yr

    B) 16 yr

    C) 16.2 yr

    D) 16.4 yr

    Correct Answer: B

    Solution :

    [b] Sum of ages of 40 students \[=(15\times 40)yr=600yr\] Average of \[(40+10)\] students \[=15.2\,\,yr\] Sum of ages of 50 students \[=(15.2\times 50)yr760yr\] Sum of ages of 10 new students \[=(760-600)yr=160yr\] Required average \[=\frac{160}{10}yr=16yr\]


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