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    Question

    The average working hours per month of the staff aged

    over 50 years in a factory were 160 and that of the staff aged under 50 years were 210. The mean working hour per month of all the staff was 200. The ratio of the number of the staff aged over 50 to that of the staff aged under 50 is:
    A 3:1 Correct Answer Incorrect Answer
    B 2:1 Correct Answer Incorrect Answer
    C 1:3 Correct Answer Incorrect Answer
    D 1:4 Correct Answer Incorrect Answer

    Solution

    The correct answer is D

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