The average weight of a group of boys is 48 kg. If 8 boys of average weight 51 kg leave and 3 boys of average weight of 42 kg join the group, then the average weight of group decrease by 1 kg 50 gm. Find the initial number of boys in a group.
When a boy weighing 47 kg left a group, the average weight of the remaining 49 students increased by 300 g. What is the average weight of the remaining 49 students?
The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then what is the weight of B?
The average weight of 19 students was 50 kg. By the admission of a new student the average weight is reduced to 49.6 kg. What is the weight of the new student?
The average weight of 56 students is 56 kg. It was found later that the figure of 45 kg was misread as 54 kg. What is the correct average?
