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SSC Sample Paper SSC CGL - Sample Paper-14

  • question_answer
    The average age of 40 students of a class is 18 yr. When 20 new students are admitted to the same class, the average age of the students of the class is increased by 6 months. The average age of newly admitted students is

    A) 19 yr                

    B) 19 yr 6 months

    C) 20 yr                            

    D) 20 yr 6 months

    Correct Answer: B

    Solution :

    Total age of 20 new students \[=(60\times 18.\text{ }5-40\times 18)\,yr\]             \[=(1110-720)\,yr\] = 390 yr \[\therefore \]      Their average age \[=\frac{390}{20}=19.5\,yr\]             = 19 yr 6 month


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