The average weight of a group of 30 friends increases by 3 kg when the weight of their 3 football coaches was added. If average weight of the group after including the weight of the 3 football coach is 33 kg, what is the average weight of their football coaches ? Choose the most appropriate option
A) 31 kg
B) 63 kg
C) 61 kg
D) 62 kg
E) 91 kg
let c=coach's avg. weight   original total weight=(30 friends)(30 kg avge)=900kg   (900+3c)/(30+3)=33 kg avg.   c=63 kg   Answer 63 kg
<result>B</result>
The average weight of a group of 30 friends increases by 3 kg when the weight of their 3 football coaches was added. If average weight of the group after including the weight of the 3 football coach is 33 kg, what is the average weight of their football coaches ?