Question

    The average of five consecutive natural numbers is 12.

    What will be the average of the seven numbers if the next two natural numbers are also included?
    A 14 Correct Answer Incorrect Answer
    B 13 Correct Answer Incorrect Answer
    C 15 Correct Answer Incorrect Answer
    D 13.5 Correct Answer Incorrect Answer

    Solution

    Let the first natural number be N. According to the question, N + (N + 1) + (N + 2) + (N + 3) + (N + 4) = 12 x 5 5N + 10 = 60 5N = 50 N = 50/5 N = 10 Sum of the seven numbers N+ (N+1) + (N+2) + (N + 3) + (N + 4) + (N+5) + (N + 6) 7N + 21 =7 x 10 + 21=91 Average of the seven numbers = 91/7 = 13 The average of the seven numbers if the next two natural numbers are also included will be 13.

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