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Object A and C are heavier. (Both are 80g each)
Object A and C - 80g each
Object B and D - 20g each
Therefore, average of all objects =
80 + 20 + 80 + 20 divide by 4 = 50g.
Object B and D - 20g each
Therefore, average of all objects =
80 + 20 + 80 + 20 divide by 4 = 50g.