There are two classes A and B. The average weight of the students in class A is 40 kg. The average weight of the students in class B is 60kg. A student, whose weight is xkg left A and joined B. As a result, the average weight of A, as well as that of  decreased, which of the following must be true?
A:35 < x <= 40
B:40 < x <60
C:60 <= x <65
D:30 < x <= 35
Answer: B

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    A how dat s happend yaar ??


    Smiley