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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 3:4, then what is the average age of company B?
    A 7 years Correct Answer Incorrect Answer
    B 11 years Correct Answer Incorrect Answer
    C 8 years Correct Answer Incorrect Answer
    D 12 years Correct Answer Incorrect Answer

    Solution

    Average of Company B = (13 × 7 - 3 × 21)/4 => (91 - 63)/4 = 7 years

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