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If the average weight of 7 people is 70 kg, and one person with a weight of 80 kg is replaced with a person weighing 60 kg, what will the new average weight be?
  1. 68 kg
  2. 67.14 kg
  3. 70 kg
  4. 71 kg
Explanation

    7*70 = 490 kg - total weight of 7 people

    80 - 60 = 20 kg less


    (490 -20)/7 ≈ 67.14 kg - new average weight ANSWER


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