The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them weighing 20 kg. What is the weight of the new person?
Answers:  A) 75  B) 65  C) 85  D) 40  E) 80
Total increase in weight = 8 × 2.5 = 20   If x is the weight of the new person, total increase in weight = x−20   =&gt; 20 = x - 20   =&gt; x = 20 + 20= 
<gadget id="calculator">20 + 20</gadget>
<output>40</output>
40   Answer is 40.
<result>D</result>
The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them weighing 20 kg. What is the weight of the new person?