Omkar.kamat wrote:

(E)

a Alone is not sufficient

b Alone is not sufficient

Combining a + b , we will get Avg weights of both the classes, but which 5 students from A will be moved to Section B will determine whether the weight increases or decreases.

Correct me if wrong

Omkar Kamat

When The Going Gets Tough, The Tough Gets Going !!

Hi Omkar,

Statement1 :We know the heaviest weight of section A and don't know the weight of those students who are coming to section B. Their weight can be 50 kgs or 1 kg (not possible in real life but here it is possible). In addition, we know the lightest weight of section B, that means average of section B should be at least 35. In this case, average of section B can increase or decrease. So, this condition alone is not sufficient.

Statement 2: Statement 2 says that weight of the lightest student in section A is 45 kgs so all students who are going to section B will be at least 45 kgs. And the average weight of section B will either be less than 40 (since it is the heaviest weight) or equivalent to 40 (if all students in section B are 40 kgs). Since the weight of the students coming to section B is more than the average of section B, new average of section B will certainly increase. So this statement is sufficient in itself.

Hope it helps.