CAT Quant Practice Problems

Question: There are 60 students in a class. These students are divided into three groups A, B and C of 15, 20 and 25 students each. The groups A and C are combined to form group D.

If one student from group A is shifted to group B, which of the following will be true?

The average weight of both groups increases
The average weight of both the groups decreases
The average weight of the class remains the same
Cannot be determined
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