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SSC Sample Paper Mock Test-19 SSC CGL Tear-II Paper-1

  • question_answer
    The average of 15 numbers is 7. If the average of the first 8 numbers be 6.5 and the average of last 8 numbers be 9.5, then the middle number is

    A) 20        

    B)  21

    C)  23

    D)  18

    Correct Answer: C

    Solution :

    The middle number \[=8\times 6.5+8\times 9.5-15\times 7\] \[=52+76-105\] \[=128-105=23\]


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