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      Question

      Sum of ages of 72 workers is 1440 years. The average

      age of 24 of them is 18 years and the average age of another 30 of them is 15 years. Find the average age of the remaining workers.
      A 31 years Correct Answer Incorrect Answer
      B 32 years Correct Answer Incorrect Answer
      C 33 years Correct Answer Incorrect Answer
      D 34 years Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Given, sum of age of 72 workers = 1440 years
      Sum of age of 24 workers = 24 ├Ч 18 = 432 years
      Sum of age of another 30 workers = 30 ├Ч 15 = 450 years
      Remaining number of workers = 72 тАУ 24 тАУ 30 = 18
      Average age of remaining 18 workers = {(1440 тАУ 432 тАУ 450)/18} = (558/18) = 31 years

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