Quantitative Aptitude

General Questions

11.  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 :
A. 10
B. 20
C. 40
D. 73
12.  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 ?
A. 8
B. 9
C. 10
D. 11
E. 12
13.  The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girl is 15.4 years. The ratio of the number of boys to the number of girls in the class is :
A. 1 : 2
B. 2 : 3
C. 3 : 4
D. 3 : 5
14.  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% a mean score of 31. The mean score of remaining 55% is :
A. 45
B. 50
C. 51.4 approx
D. 54.6 approx
15.  The average salary of all the workers in a workshop is ₹ 8000. The average salary of 7 technicians is ₹ 12000 and the average salary of the rest is ₹ 6000. The total number of workers in the workshops is :

A. 20
B. 21
C. 22
D. 23
16.  10 years ago, the average age of a family of 4 members was 24 years. Two children having been born (with age different of 2 years), the present average age of the family is the same. The present age of the youngest child is :
A. 1 year
B. 2 years
C. 3 years
D. 5 years
17.  A cricketer has a certain average for 10 innings. In the eleventh inning, he scored 108 runs, thereby increasing his average by 6 runs. His new average is :
A. 48 runs
B. 52 runs
C. 55 runs
D. 60 runs
18.  The average age of a husband and his wife was 23 years at the time of their marriage. After five years they have a one-year old child. The average age of the family now is :
A. 19 years
B. 23 years
C. 28.5 years
D. 29.3 years
19.  A cricketer whose bowling average is 12.4 runs per wicket takes 5 wickets for 26 runs and thereby decreases his average by 0.4. The number of wickets taken by him till the last match was :
A. 64
B. 72
C. 80
D. 85
20.  The average monthly salary of 20 employees in an organisation is ₹ 1500. If the manager's salary is added, then the average salary increases by ₹ 100. What is the manager's monthly salary ?
A. ₹ 2000
B. ₹ 2400
C. ₹ 3600
D. ₹ 4800

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