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10th Class Mathematics Sample Paper Maths Olympiad Model Test Paper-17

  • question_answer
    Find the mean of 30 numbers, if the mean of first ten of them is 12 and the mean of remaining 20 is 9.

    A)  9.5                              

    B)  10

    C)  12.5                            

    D)  18

    E)  None of these

    Correct Answer: B

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