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The average weight of a group of eight people increased by 2.5 kg when a person weighing 80 kg joined in place of one of the members of the group. The weight of the member replaced was: |
60 kg 77.5 kg 70 kg 62.5 kg |
60 kg |
Total Increment in weight = 8 × 2.5 = 20 kg Weight of old man = weight of new man - 20 Weight of old man = 80 - 20 = 60 kg |
