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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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