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?
Created: 6 months ago | Updated: 2 weeks ago
Job Solution Exim Bank Ltd Exim Bank Ltd - Management Trainee Officer - 11.01.2013 গণিত
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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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