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SSC Sample Paper Mock Test-6 SSC CGL Tear-II Paper-1

  • question_answer
    The average of 30 numbers is 12. The average of the first 20 of them is 11 and that of the next 9 is 10. The last number is    

    A)                        60       

    B)  45           

    C)  40

    D)  50    

    Correct Answer: D

    Solution :

    Last Number \[=30\times 12-20\times 11-9\times 10\] \[=360-220-90=360-310=50\]


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