# SSC CGL Exam Tier-I: Quantitative Aptitude: Averages: Quiz!

20 Questions | Total Attempts: 891  Settings  • 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
• 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.
There are 50 students in a class. Their average weight is 45 kg. When one student leaves the class the average weight reduces by 100 g. What is the weight of the student who left the class?
• 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 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 in a class is 18 yr. When 20 new students are admitted to the same class, the average age of the students in 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 in 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 to 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 in a school is 42 kg. If the weight of the teacher is included, the mean rises by 400 g. Find the weight of the teacher (in kg).
• A.

66

• B.

56

• C.

55

• D.

57

• 20.
Ram aims to score an average of 80 marks in quarterly and half yearly exams. But his average in quarterly is 3 marks less than his target and that in half-yearly is 2 marks more than his aim. The difference between the total marks scored in both the exams is 25. Total marks aimed by Ram is
• A.

380

• B.

400

• C.

410

• D.

420 Back to top