logo

CuriousTab

CuriousTab

Discussion


Home Aptitude Average Comments

  • Question
  • 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. The number of pupils in the class is :


  • Options
  • A. 45
  • B. 40
  • C. 39
  • D. 37

  • Correct Answer
  • 40 

    Explanation

    Let there be x pupils in the class.

    Total increase in marks = (x * 1/2) = x/2.

    x/2 = (83 - 63) => x/2 = 20 => x = 40.


  • Average problems


    Search Results


    • 1. After replacing an old member by a new member, it was found that the average age of five members of a club is the same as it was 3 years ago. What is the difference between the ages of the replaced and the new member ?

    • Options
    • A. 12
    • B. 13
    • C. 14
    • D. 15
    • Discuss
    • 2. The mean temperature of Monday to Wednesday was 37 degree celsius and of Tuesday to Thursday was 34 degree celsius . If the temperature on Thursday was (4/5) th that of Monday, the temperature on Thursday was?

    • Options
    • A. 38 degree celsius
    • B. 36 degree celsius
    • C. 40 degree celsius
    • D. 39 degree celsius
    • Discuss
    • 3. The average of 7 consecutive numbers is 20. The largest of these numbers is :

    • Options
    • A. 21
    • B. 22
    • C. 23
    • D. 24
    • Discuss
    • 4. The average weight of a class of 24 students is 35 kg. If the weight of the teacher be included, the average rises by 400 g. The weight of the teacher is :

    • Options
    • A. 45 kg
    • B. 46 kg
    • C. 47 kg
    • D. 48 kg
    • Discuss
    • 5. The average of five consecutive odd numbers is 61. What is the difference between the highest and lowest numbers :

    • Options
    • A. 4
    • B. 8
    • C. 12
    • D. 16
    • Discuss
    • 6. The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is :

    • Options
    • A. 35
    • B. 36.5
    • C. 40
    • D. 42
    • Discuss
    • 7. Of the four numbers, whose average is 60, the first is one-fourth of the sum of the last three. The first number is :

    • Options
    • A. 17
    • B. 29
    • C. 36
    • D. 48
    • Discuss
    • 8. 10 years ago, the average age of a family of 4 members was 24 years. Two children having been born (with age diference of 2 years), the present average age of the family is the same. The present age of the youngest child is :

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
    • Discuss
    • 9. Out of 9 persons, 8 persons spent Rs. 30 each for their meals. The ninth one spent Rs. 20 more than the average expenditure of all the nine. The total money spent by all of them was :

    • Options
    • A. Rs. 292.50
    • B. Rs. 297.50
    • C. Rs. 298
    • D. Rs. 298.50
    • Discuss
    • 10. In an examination, a pupil's average marks were 63 per paper. If he had obtained 20 more marks for his Geography paper and 2 more marks for his History paper, his average per paper would have been 65. How many papers were there in the examination ?

    • Options
    • A. 8
    • B. 9
    • C. 10
    • D. 11
    • Discuss


    Comments

    There are no comments.

Enter a new Comment