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SSC Sample Paper Mock Test-7 SSC CGL Tear-II Paper-1

  • question_answer
    In a school, the average age of students is 6 yr the average age of 12 teachers is 40 yr. If the average age of the combined group of all the teachers and students is 7 yr, then the number of students

    A)  396     

    B)  400         

    C)  408     

    D)  416  

    Correct Answer: A

    Solution :

    Let the number of students be a. Then, \[7=\frac{n\times 6+12\times 40}{n+12}\Rightarrow 7n+84=6n+480\] \[n=480-84=396\]


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