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Answer

Correct Option is 39

Solution:
As given, at station A ,80-person board and the ratio of male to female is 9: 7, therefore there will be 45 male and 35 female
Then at station B,15 men got down and 5 women board the train, therefore total men at station B be 30 and total female is 40
Then at station C, half of the women got down and same no. of men boarded the train, then total male will be 50 and total female will be 20
Finally at station D, x no. of male got down and ratio of male to female is 7 : 4, then total no. of male will be 35 and total female will be 20

 

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