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    Question

    Find the sum of the first and last numbers if the

    average of seven continuous numbers is 90.
    A 180 Correct Answer Incorrect Answer
    B 172 Correct Answer Incorrect Answer
    C 124 Correct Answer Incorrect Answer
    D 185 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let numbers be: (a - 3), (a - 2), (a - 1), a, (a + 1), (a + 2), (a + 3)

    Sum = (7a) and average = (7a / 7) = 90

    ⇒ a = 90

    Sum of smallest and largest = (a - 3) + (a + 3) = 2a = 2 × 90 = 180

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