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7th Class Mathematics Data Handling Question Bank Self Test-14

  • question_answer
    The mean age of 30 students of a class is 10 years. If the age of their teacher is also included then the mean is increased by one year. What is the age of the teacher?

    A)  21 years

    B)  22 years

    C)  41 years

    D)  42 years

    E)  None of these

    Correct Answer: C

    Solution :

       


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