Question

The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg. Find the average weights of all the boys in the class.
1) 47.55 kg
2) 48.55 kg
3) 48 kg
4) 49.25 kg

Answer 1

The average weight of 16 boys in a class is 50.25 kg. Then their total weight is: 50.25*16=804 kg.
The average weight of remaining 8boys is 45.15 kg. Total weight of 8 boys is: 45.15*8=361.2 kg.
Total weight of (16+8)=24 boys in the class is: (804+361.2)= 1165.2 kg.
Therefore average weight of all the boys in the class is: 1169.2/24=48.55 kg