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Railways Sample Paper RRB (Group D) Sample Test Paper-5

  • question_answer
    The average of 30 numbers is 40 and that of other 40 numbers is 30. The average of all the numbers is

    A)  34.5                

    B)  \[34\frac{2}{7}\]

    C)  35                   

    D)  34

    Correct Answer: B

    Solution :

    [b] Sum of 30 numbers \[=30\times 40=1200\] Sum of 40 numbers \[=40\times 30=1200\] Average of 70 numbers \[=\frac{1200+1200}{70}=\frac{2400}{70}=34\frac{2}{7}\]


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