The average weight of a group of 30 friends decreases by 1 kg when the weight of one of them was removed. If average weight of the group after removing the weight of this one person is 29 kg, what is the weight of their new friend ?
Options.
A) 31 kg B) 60 kg C) 59 kg D) 62 kg E) 91 kg
let n= weight of one person who was removed from group   original total weight=(30 friends)(30 kg avge)=900kg   (900-n)/(30-1)=29 kg avg.   n=59 kg   Answer = 59 kg
<result>C</result>
The average weight of a group of 30 friends decreases by 1 kg when the weight of one of them was removed. If average weight of the group after removing the weight of this one person is 29 kg, what is the weight of their new friend ?