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1. The average weight of 8 people increases by 2.5 kg when a new person comes in place of one of them weighting 65 kg. What might be the weight of the new person?
- A. 85 kg
- B. 85 kg
- C. 85 kg
- D. 85 kg
Answer: Option A
Explanation:
Let the average of 8 people be x kg
And the weight of the new person be y kg
Sum of 8 people weight is
⇒ 8 × x = 8x kg
When the person is replaced.
⇒ 8x + y - 65 = 8 × (x + 2.5)
⇒ 8x + y - 65 = 8x + 20
⇒ y = 65 + 20 = 85 kg
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