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Given Students:30 students
Emma's rank 3rd/Girls
Ben's Rank 6th/30

(1) Ben was among the top 25% of the boys merit list in the class in which 60% were boys.

This gives us There are 18 Boys and 12 Girls.
And Ben's Rank is <=4th among Boys
Now We do see possibility of Both Emma being ranked overall higher than Ben(If all top 3 girls scored higher than the 6th ranked boy i.e Ben) and also possibility of Emma having ranked lower than Ben (If All girls scored lesser than the 6th ranked boy i.e Ben)
Hence insufficient

(2) There were three boys among the top five rank holders, and three girls among the top ten rank holders.
Now we get, among the top 5 rankers, we have 3 Boys and 2 girls i.e Boys Ranked 1st through 3rd (among boys) and Girls ranked 1st through 2nd (Among Girls).

Now after top 5 people, is ranked Ben (6th Overall)
Hence emma has to be ranked lower than Ben (As she is 3rd among girls).

Hence Sufficient

IMO Ans B
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