10th Class Mathematics Related to Competitive Exam Question Bank Commercial Mathematics

  • question_answer
    The average of twenty results is 18, that of first 9 is 14 and that of last 9 is 17. The average of middle two results is

    A)  45                         

    B)         50.5

    C)  40.5                        

    D)         51.5

    Correct Answer: C

    Solution :

    Not available


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