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SSC Sample Paper SSC-CGL TIER - I Sample Test Paper-8

  • question_answer
    The average age of 30 boys of a class is 15 years. A boy whose age is 20 years leaves the class and another two boy?s join the class whose age are differ by 5 years. If the average age of all boys becomes 15 years now, then the age of the younger of the two boys is -

    A) 20 years           

    B) 15 years

    C) 10 years                       

    D) 8 years

    Correct Answer: B

    Solution :

    Total age of remaining 29 boys   \[=\text{ }30\times 15-20\Rightarrow 450-20=430\] Suppose the age of two new boys be x years and (x + 5) years then, \[430+x+x+\text{ }5=15\times 31\] \[2x=465-435=30\Rightarrow ~x=\mathbf{15years}\] The age of younger boy = 15 years


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