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    Question

    The average of 13 natural numbers is 45. If the average

    of first 7 numbers is 35 and the average of last seven numbers is 55, then find the value of number which is at 7 th  place.
    A 45 Correct Answer Incorrect Answer
    B 34 Correct Answer Incorrect Answer
    C 40 Correct Answer Incorrect Answer
    D 32 Correct Answer Incorrect Answer

    Solution

    Sum of the 13 natural numbers = 13 x 45 = 585

    Sum of the first 7 numbers = 7 x 35 = 245

    Sum of the last 7 numbers = 7 x 55 = 385

    Therefore, required number = {(245 + 385) - 585} = 45

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