Single correct option
The average weight of 10 people increases by 2.5 kg when a new person replaces one of them who weighed 55 kg. What is the weight of the new person?
- A. 70 kg
- B. 75 kg
- C. 80 kg
- D. 85 kg
Show answer and solution
Answer: (C) 80 kg
Total weight increases by 10 × 2.5 = 25 kg when the replacement happens (since the average of 10 people rises by 2.5 kg each). This entire increase is due to the new person replacing the 55 kg person, so new person's weight = 55 + 25 = 80 kg.
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