Question

The average weight of a 10 member group is 52 kg. Average weight was reduced by 2 kg when two members left the group. Then, three new members joined the group and the average increased by 3 kg. What is the average weight of the newly joined members?​

Answer 1

Answer:

avg. weight of 10member is 52kg.

now, avg weight of 8member is 50kg

sum of weight of 8member is 50x8=400kg

after joining 3new member , now avg. weight of 11member is 53kg

sum of weight of 11member is 53×11=583kg

so, sum of weight of 3new member is 583-400=183kg

so, avg=183÷3=61 kg