UPSC 2017 CDS I Math Paper

Let the total population of the village be 9x.
Number of males in the village =

5

9

×9x=5x
Therefore, number of females in the village =9x−5x=4x
Number of married males in the village=

30

100

×5x=

3

2

x
Therefore, number of married females in the village=

3

2

x
Number of unmarried females in the village=4x−

3

2

x=

5

2

x
Therefore, percentage of unmarried females in the village