Discussion
How many girls are there out of these 7 students ?
Answer: B
Correct answer: 3 or 4
F sits with only B, so that bench holds exactly those two. A is on bench I and G on bench III. C will not sit with A, E or D, so she must join G on bench III, which leaves D and E to sit with A. The benches are therefore I: A, D, E - II: F, B - III: C, G. Each bench needs a girl: C covers III, so B must be the girl on II, and one of A and D the girl on I - D, since the group of girls named is B, C and D.
Three girls are certain: C on bench III, B - who must be the girl on bench II, since F is a boy - and D on bench I, E being C’s brother and therefore a boy. Nothing tells us whether G is a girl or a boy, because C already satisfies bench III’s requirement. So the total is 3 or 4.
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