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?
Answer: 67.14 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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