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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 $D$.

What is the average weight of the students in group D?

1. More than the average weight of A
2. More than the average weight of C
3. Less than the average weight of C
4. Cannot be determined.

The answer is D. Can't be determined.

Say avg weight of A is 100/15 and C is 1000/25. Avg weight of D is 1100/40 which is more than the avg weight of A and less than the avg weight of C.

In other scenario answers could change. Hence can't be determined
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