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Arithmetic Aptitude :: Boats and Streams

  1. 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:
  2. A.
    53.33
    B.
    54.68
    C.
    55
    D.
    None of these

  3. The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% of a mean score of 31. The mean score of remaining 55% is
  4. A.
    40.8 approx
    B.
    45.3 approx
    C.
    51.4 approx
    D.
    53.8 approx

  5. 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.
  6. A.
    47.55 kg
    B.
    48 kg
    C.
    48.55 kg
    D.
    49.25 kg

  7. 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:
  8. A.
    250
    B.
    276
    C.
    280
    D.
    285

  9. 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:
  10. A.
    53.33
    B.
    54.68
    C.
    55
    D.
    None of these

  11. The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% of a mean score of 31. The mean score of remaining 55% is
  12. A.
    40.8 approx
    B.
    45.3 approx
    C.
    51.4 approx
    D.
    53.8 approx

  13. 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.
  14. A.
    47.55 kg
    B.
    48 kg
    C.
    48.55 kg
    D.
    49.25 kg

  15. 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:
  16. A.
    250
    B.
    276
    C.
    280
    D.
    285

  17. 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:
  18. A.
    53.33
    B.
    54.68
    C.
    55
    D.
    None of these

  19. The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% of a mean score of 31. The mean score of remaining 55% is
  20. A.
    40.8 approx
    B.
    45.3 approx
    C.
    51.4 approx
    D.
    53.8 approx