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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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