Question

Average weight of 45 students is 71.2kg. when weight of 3 new friends is added average weight becomes 71kg. find average weight of new friend.​

Answer 1

Answer:

⇒ Total number of person =8

⇒ Increased in average weight =2.5,kg

⇒ Total weight increased =8×2.5kg=20kg

⇒ Weight of replaced person =65kg

⇒ Weight of new person =(65+20)kg=85kg