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      Question

      The average of a set of 's' numbers is 45. If 180 is

      added to the set, then the average of the set becomes 45.2. Find the value of '4 X (s - 18)'.
      A 2624 Correct Answer Incorrect Answer
      B 2700 Correct Answer Incorrect Answer
      C 2500 Correct Answer Incorrect Answer
      D 2600 Correct Answer Incorrect Answer
      E 2650 Correct Answer Incorrect Answer

      Solution

      Sum of all 's' numbers = 45s
      ATQ:
      (45s + 180) / (s + 1) = 45.2
      Multiplying both sides by (s + 1):
      45s + 180 = 45.2(s + 1)
      45s + 180 = 45.2s + 45.2
      180 - 45.2 = 45.2s - 45s
      134.8 = 0.2s
      s = 674
      4 X (s - 18):
      4 X (674 - 18) = 4 X 656 = 2624

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