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

20 Questions | By Jagranjosh | Updated: Mar 21, 2022 | Attempts: 959

Questions

Settings

Create your own Quiz

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
- 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