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CAT 1997 | Question: 105

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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 students from Group A is shifted to group B, which of the following will be true?

  1. The average weight of both groups increases.
  2. The average weight of both the groups decreases.
  3. The average weight of the class remains the same.
  4. Cannot be determined.
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