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If 8 persons have an average of 12.5 and one person of 18 kg is replaced with 10 kg, the new average will be:
  1. 10.5
  2. 11.5
  3. 12.5
  4. 13.5
Explanation

Average of 8 persons = 12.5

So total weight:

8 times 12.5 = 100

One person of 18 kg is replaced by 10 kg:

New total:

New average:

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