Q.

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 all the students of the class have the same weight, then which of the following is false?

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a

The average weight of all the four groups is the same

b

The total weight of A and C is twice the total weight of B

c

The average weight of D is greater than the average weight of A

d

The average weight of all the groups remains the same even if a number of students are shifted from one group to another

answer is C.

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