Class VII

If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is:
  1. 53.33
  2. . 54.68
  3. 55
  4. . None of these
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:
  1. 17 kg
  2. 20 kg
  3. . 26 kg
  4. 31 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:
  1. 250
  2. 276
  3. 280
  4. 285
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 kg
  3. 48.55 kg
  4. 49.25 kg
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