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UPSC 2014 CDS I Math Paper

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Question : 10

Total: 100

The average age of the male employees in a firm is 52 years and that of female employees is 42 years. The mean age of all the employees is 50 years. The percentages of male and female employees are respectively

80% and 20%
20% and 80%
50% and 50%
52% and 48%

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