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      Question

      The average of a set of s numbers is 41. If 90 is added

      to the set, then the average of the set becomes 42. Find the value of 5 X (s - 28).
      A 80 Correct Answer Incorrect Answer
      B 90 Correct Answer Incorrect Answer
      C 95 Correct Answer Incorrect Answer
      D 100 Correct Answer Incorrect Answer

      Solution

      Sum of all 's' numbers of the set = 41 X s = '41s' ATQ; (41s + 90)/(s + 1) = 42
      Or, 41s + 90 = 42s + 42 Or, 90 - 42 = 42s - 41s Or, 48 = s So, required value = 5 X (48 - 28) = 100

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