Average MCQs

Practice Average MCQs with answers and detailed explanations. Learn basic average concepts, average age, marks, salary, speed, combined average, weighted average and advanced aptitude questions designed for SSC, Railway, Banking, UPSC, JKSSB, Police, Teaching and other competitive exams.

965 Total

Question #181 Report Error

The average age of 8 students is 15 years. If the teacher's age is included, the average becomes 18 years. What is the teacher's age?

A. 45

B. 39

C. 42

D. 40

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Correct Answer: Option C

Explanation:
Total age of students = 8×15 = 120. Total age including teacher = 9×18 = 162. Teacher's age = 162−120 = 42.

This question belongs to: Maths Average

Question #182 Report Error

The average of 10 numbers is 35. If each number is increased by 5, what will be the new average?

A. 38

B. 42

C. 35

D. 40

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Correct Answer: Option D

Explanation:
When each number increases by 5, the average also increases by 5. New average = 35+5 = 40.

This question belongs to: Maths Average

Question #183 Report Error

The average marks of 12 students is 72. If one student scored 84 marks, what is the total marks of the remaining students?

A. 744

B. 720

C. 768

D. 780

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Correct Answer: Option D

Explanation:
Total marks = 12×72 = 864. Remaining students' marks = 864−84 = 780.

This question belongs to: Maths Average

Question #184 Report Error

The average of 6 consecutive even numbers is 25. What is the largest number?

A. 34

B. 30

C. 32

D. 28

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Correct Answer: Option B

Explanation:
Numbers are 20,22,24,26,28,30. Their average is 25. Largest number = 30.

This question belongs to: Maths Average

Question #185 Report Error

The average of three numbers is 45. If two numbers are 40 and 50, the third number is:

A. 50

B. 40

C. 45

D. 55

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Correct Answer: Option C

Explanation:
Total of three numbers = 3×45 = 135. Third number = 135−40−50 = 45.

This question belongs to: Maths Average

Question #186 Report Error

The average weight of 20 boys is 60 kg. If one boy weighing 80 kg leaves, what is the average weight of the remaining boys?

A. 58.95 kg

B. 61 kg

C. 59 kg

D. 60 kg

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Correct Answer: Option A

Explanation:
Total weight = 20×60 = 1200 kg. Remaining weight = 1200−80 = 1120 kg. Average = 1120/19 = 58.95 kg.

This question belongs to: Maths Average

Question #187 Report Error

The average of 7 numbers is 18. If one number is 24, what is the average of the remaining 6 numbers?

A. 17

B. 18

C. 19

D. 16

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Correct Answer: Option A

Explanation:
Total = 7×18 = 126. Remaining total = 126−24 = 102. Average = 102/6 = 17.

This question belongs to: Maths Average

Question #188 Report Error

The average salary of 15 employees is ₹24,000. If the manager earning ₹45,000 leaves, what is the average salary of the remaining employees?

A. ₹24,000

B. ₹23,000

C. ₹22,500

D. ₹25,000

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Total salary = 15×24000 = 360000. Remaining salary = 360000−45000 = 315000. Average = 315000/14 = 22500.

This question belongs to: Maths Average

Question #189 Report Error

The average of first 9 natural numbers is:

A. 5

B. 4

C. 4.5

D. 5.5

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Correct Answer: Option A

Explanation:
Average of first n natural numbers = (n+1)/2. For n=9, average = 5.

This question belongs to: Maths Average

Question #190 Report Error

The average score of a batsman in 11 innings is 48 runs. If his score in the next innings is 70, what becomes his new average?

A. 52

B. 51

C. 49.83

D. 50

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Correct Answer: Option C

Explanation:
Total runs in 11 innings = 11×48 = 528. New total = 528+70 = 598. Average = 598/12 = 49.83.

This question belongs to: Maths Average

Question #191 Report Error

The average of 4 consecutive odd numbers is 32. What is the smallest number?

A. 31

B. 27

C. 29

D. 33

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Correct Answer: Option C

Explanation:
Numbers are 29,31,33,35. Their average is 32. Smallest number = 29.

This question belongs to: Maths Average

Question #192 Report Error

The average of 25 numbers is 40. If the average of first 15 numbers is 38, what is the average of the remaining 10 numbers?

A. 42

B. 43

C. 41

D. 44

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Correct Answer: Option B

Explanation:
Total of 25 numbers = 1000. Total of first 15 = 570. Remaining total = 430. Average = 430/10 = 43.

This question belongs to: Maths Average

Question #193 Report Error

The average of 8 numbers is 50. If one number 70 is replaced by 54, what is the new average?

A. 50

B. 49

C. 48

D. 52

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Original total = 8×50 = 400. New total = 400−70+54 = 384. New average = 384/8 = 48.

This question belongs to: Maths Average

Question #194 Report Error

The average marks of boys in a class is 60 and that of girls is 70. If there are 20 boys and 30 girls, the average marks of the whole class is:

A. 65

B. 64

C. 66

D. 68

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Correct Answer: Option C

Explanation:
Combined average = (20×60 + 30×70)/50 = 3300/50 = 66.

This question belongs to: Maths Average

Question #195 Report Error

The average of 5 consecutive numbers is 18. What is the largest number?

A. 21

B. 18

C. 20

D. 19

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Correct Answer: Option C

Explanation:
Numbers are 16,17,18,19,20. Largest number = 20.

This question belongs to: Maths Average

Question #196 Report Error

The average monthly income of a person for 12 months is ₹30,000. If he earned ₹36,000 in one month, the average income for the remaining 11 months is:

A. ₹30,000

B. ₹29,000

C. ₹29,454.55

D. ₹31,000

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Total income = 12×30000 = 360000. Remaining income = 360000−36000 = 324000. Average = 324000/11 = 29454.55.

This question belongs to: Maths Average

Question #197 Report Error

The average of 9 numbers is 27. If one number is wrongly taken as 45 instead of 27, the incorrect average is:

A. 28

B. 30

C. 31

D. 29

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
Correct total = 9×27 = 243. Incorrect total = 243+18 = 261. Incorrect average = 261/9 = 29.

This question belongs to: Maths Average

Question #198 Report Error

The average of 40 observations is 52. If one observation was recorded as 72 instead of 27, the correct average is:

A. 52.125

B. 51.125

C. 50.875

D. 51.875

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Recorded total = 40×52 = 2080. Correct total = 2080−72+27 = 2035. Correct average = 2035/40 = 50.875.

This question belongs to: Maths Average

Question #199 Report Error

The average of five numbers is 27. If one number is excluded, the average becomes 25. What is the excluded number?

A. 45

B. 35

C. 30

D. 40

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Sum of five numbers = 5 × 27 = 135. Sum of four numbers = 4 × 25 = 100. Excluded number = 135 - 100 = 35.

This question belongs to: Maths Average

Question #200 Report Error

The average age of 12 students is 20 years. If the age of the teacher is included, the average increases by 1 year. What is the age of the teacher?

A. 34

B. 33

C. 32

D. 31

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Total age of students = 12 × 20 = 240. New average = 21. Total age of 13 people = 13 × 21 = 273. Teacher's age = 273 - 240 = 33 years.

This question belongs to: Maths Average

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