SSC CGL Exam (Tier-I): Quantitative Aptitude: Averages: Free Online Practice Set

20 Questions | Total Attempts: 860

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Questions and Answers
  • 1. 
    The average age of a jury of 5 is 40. If a member aged 35 resigns and a man aged 25 becomes a member, then the average age of the new jury is
    • A. 

      30 yr

    • B. 

      38 yr

    • C. 

      40 yr

    • D. 

      42 yr

  • 2. 
    The average of the runs made by Raju, Shyam and Hari is 7 less than that made by Shyam, Hari and Kishore. If the number of Kishore's run is 35, what is Raju's run?
    • A. 

      21

    • B. 

      35

    • C. 

      7

    • D. 

      14

  • 3. 
    The mean of 50 numbers is 30. Later it was discovered that two entries were wrongly entered as 82 and 13 instead of 28 and 31. Find the correct mean.
    • A. 

      36.12

    • B. 

      30.66

    • C. 

      29.28

    • D. 

      38.21

  • 4. 
    One third of a certain journey is covered at the rate of 25 km/h, one-fourth at the rate of 30 km/h and the rest at 50 km/h. The average speed for the whole journey is
    • A. 

      35 km/h

    • B. 
    • C. 

      30 km/h

    • D. 
  • 5. 
    The average of 5 numbers is 140. If one number is excluded, the average of the remaining 4 numbers is 130. The excluded number is
    • A. 

      135

    • B. 

      134

    • C. 

      180

    • D. 

      150

  • 6. 
    The average weight of 5 persons sitting in a boat is 38 kg. The average weight of the boat and the persons sitting in the boat is 52 kg. What is the weight of the boat?
    • A. 

      228 kg

    • B. 

      122 kg

    • C. 

      232 kg

    • D. 

      242 kg

  • 7. 
    • A. 

      45 kg

    • B. 

      47.9 kg

    • C. 

      49.9 kg

    • D. 

      50.1 kg

  • 8. 
    Out of 4 numbers, whose average is 60, the first one is one fourth of the sum of the last three. The first number is
    • A. 

      15

    • B. 

      45

    • C. 

      48

    • D. 

      60

  • 9. 
    In a class, the average score of girls in an examination is 73 and that of boys is 71. The average score for the whole class is 71.8. Find the percentage of girls
    • A. 

      40%

    • B. 

      50%

    • C. 

      55%

    • D. 

      60%

  • 10. 
    The average of the first 100 positive integers is
    • A. 

      100

    • B. 

      51

    • C. 

      50.5

    • D. 

      49.5

  • 11. 
    Out of the three numbers, the first number is twice of the second and the second is thrice of the third number. If the average of these 3 numbers is 20, then the sum of the largest and smallest numbers is
    • A. 

      24

    • B. 

      42

    • C. 

      54

    • D. 

      60

  • 12. 
    The average age of 40 students of a class is 18 yr. When 20 new students are admitted to the same class, the average age of the students of the class is increased by 6 months. The average age of newly admitted students is
    • A. 

      19 yr

    • B. 

      19 yr 6 months

    • C. 

      20 yr

    • D. 

      20 yr 6 months

  • 13. 
    The average age of 40 students of a class is 15 yr. When 10 new students are admitted, the average age is increased by 0.2 yr. The average age of new students is
    • A. 

      15.2 yr

    • B. 

      16 yr

    • C. 

      16.2.yr

    • D. 

      16.4 yr

  • 14. 
    The average of 6 observations is 45.5. If one new observation is added to the previous observation, then the new average becomes 47. The new observation is
    • A. 

      58

    • B. 

      56

    • C. 

      50

    • D. 

      46

  • 15. 
    The average of marks scored by the students of a class is 68. The average of marks of the girls in the class is 80 and that of boys is 60. What is the percentage of boys in the class?
    • A. 

      40

    • B. 

      60

    • C. 

      65

    • D. 

      70

  • 16. 
    The average age of 30 boys in a class is 15 yr. One boy aged 20 yr, left the class but two new boys came in his place whose ages differ by 5 yr. If the average age of all the boys now in the class still remains 15 yr, the age of the younger newcomer is
    • A. 

      20 yr

    • B. 

      15 yr

    • C. 

      10 yr

    • D. 

      8 yr

  • 17. 
    Out of 10 teachers of a school, one teacher retires and in his place a new teacher of age 25 yr joins. As a result of it, the average age of the teachers is reduced by 3 yr. The age of the retired teacher is
    • A. 

      60 yr

    • B. 

      58 yr

    • C. 

      56 yr

    • D. 

      55 yr

  • 18. 
    3 yr ago, the average age of a family of 5 members was 17 yr. A baby having been born, the average age of the family is the same today. The present age of the baby is
    • A. 

      3 yr

    • B. 

      2 yr

    • C. 
    • D. 

      1 yr

  • 19. 
    The mean weight of 34 students of a school is 42 kg. If the weight of the teacher be included, the mean rises by 400 g. Find the weight of the teacher (in kg).
    • A. 

      66

    • B. 

      56

    • C. 

      55

    • D. 

      57

  • 20. 
    • A. 

      380

    • B. 

      400

    • C. 

      410

    • D. 

      420