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 the weight of B is:
- (a) 17 kg
- (b) 20 kg
- (c) 26 kg
- (d) 31 kg
The average weight of 8 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg. Find the average weight of all the boys in the class.
- (a) 47.55 kg
- (b) 48.55 kg
- (c) 48.25 kg
- (d) 49.25 kg
A library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is:
- (a) 250
- (b) 276
- (c) 280
- (d) 285
If the average marks of three batches of 55, 60, and 45 students respectively are 50, 55, and 60, then the average marks of all the students is:
- (a) 53.33
- (b) 54.68
- (c) 55
- (d) None of these
A pupil’s marks were wrongly entered as 83 instead of 63. Due to that, the average marks for the class got increased by half (1/2). The number of pupils in the class is:
- (a) 10
- (b) 20
- (c) 40
- (d) 73