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    Question

    Average age of company A is 21 years and average age of

    both companies A and B is 13 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 13 years Correct Answer Incorrect Answer
    B 10 years Correct Answer Incorrect Answer
    C 8 years Correct Answer Incorrect Answer
    D 9 years Correct Answer Incorrect Answer

    Solution

    Average of Company B = (11 × 13 - 3 × 21)/8 => (143 - 63)/8 = 80/8 = 10 years

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