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Question
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?
85 kg
80 kg
75 kg
Cannot be determined
None of these
ANSWER : 1
Descrption
<p>Let the average of 8 people be x kg</p><p>And the weight of the new person be y kg</p><p>Sum of 8 people weight is</p><p>⇒ 8 × x = 8x kg</p><p>When the person is replaced.</p><p>⇒ 8x + y - 65 = 8 × (x + 2.5)</p><p>⇒ 8x + y - 65 = 8x + 20</p><p>⇒ y = 65 + 20 = 85 kg</p>
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