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      Question

      Average age of company A is 20 years and average age of

      both companies A and B is 12 years. If the ratio of number of employees in company A and B is 3:8, then what is the average age of company B?
      A 10 years Correct Answer Incorrect Answer
      B 9 years Correct Answer Incorrect Answer
      C 8 years Correct Answer Incorrect Answer
      D 7 years Correct Answer Incorrect Answer

      Solution

      Average of Company B = (12 × 11 - 3 × 20)/8 => (132 - 60)/8 = 9 years

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