ЁЯУв Too many exams? DonтАЩt know which one suits you best? Book Your Free Expert ЁЯСЙ call Now!

    Question

    Average of nine consecutive numbers is 55. Find the sum

    of the smallest and largest number.
    A 108 Correct Answer Incorrect Answer
    B 110 Correct Answer Incorrect Answer
    C 112 Correct Answer Incorrect Answer
    D 114 Correct Answer Incorrect Answer

    Solution

    Let the numbers be (b - 4), (b - 3), (b - 2), (b - 1), b, (b + 1), (b + 2), (b + 3), and (b + 4). The average of these numbers is (b - 4 + b - 3 + b - 2 + b - 1 + b + b + 1 + b + 2 + b + 3 + b + 4) / 9 = 55. Simplifying, (9b) / 9 = 55, so b = 55. The sum of the smallest and largest numbers is (b - 4) + (b + 4) = b + b = 2b = 2 x 55 = 110.

    Practice Next
    More Average Questions
    ask-question