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 #21 Report Error

The average weight of 20 students is 50 kg. If the teacher's weight is added, the average becomes 52 kg. Find the teacher's weight.

A. 92 kg

B. 88 kg

C. 90 kg

D. 94 kg

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Total weight of 20 = 20×50=1000. Total of 21 =21×52=1092. Teacher's weight =1092-1000=92.

This question belongs to: Maths Average

Question #22 Report Error

Find the average of all numbers from 1 to 15 that are divisible by 3.

A. 9

B. 12

C. 8

D. 10

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Numbers: 3,6,9,12,15 sum=45, count=5, avg=9.

This question belongs to: Maths Average

Question #23 Report Error

The average of 8 numbers is 35. If each number is multiplied by 2, what is the new average?

A. 35

B. 105

C. 17.5

D. 70

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
New average = 35×2=70.

This question belongs to: Maths Average

Question #24 Report Error

The average of 10 numbers is 25. If one number is removed, the average becomes 23. What is the removed number?

A. 40

B. 45

C. 43

D. 38

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Sum of 10 =250. Sum of 9 =9×23=207. Removed number =250-207=43.

This question belongs to: Maths Average

Question #25 Report Error

What is the average of the cubes of first 3 natural numbers?

A. 10

B. 12

C. 14

D. 18

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Cubes:1,8,27 sum=36, avg=36/3=12.

This question belongs to: Maths Average

Question #26 Report Error

The average age of 4 boys is 16 years. If their ages are in ratio 1:2:3:4, what is the age of the oldest boy?

A. 25.6 years

B. 26

C. 28

D. 24

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Sum =4×16=64. Ratio sum=10. Oldest = (4/10)×64 =25.6.

This question belongs to: Maths Average

Question #27 Report Error

The average of 6 numbers is 18. If one number is 30, find the average of the remaining 5.

A. 16

B. 16.8

C. 15.6

D. 14.4

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Sum=6×18=108. Remaining sum=108-30=78. Avg=78/5=15.6.

This question belongs to: Maths Average

Question #28 Report Error

Find the average of the first 8 multiples of 4.

A. 22

B. 18

C. 20

D. 16

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Multiples: 4,8,12,16,20,24,28,32 sum=144, count=8, avg=18.

This question belongs to: Maths Average

Question #29 Report Error

The average of 9 observations is 40. If each observation is decreased by 4, what is the new average?

A. 40

B. 44

C. 32

D. 36

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
New average =40-4=36.

This question belongs to: Maths Average

Question #30 Report Error

The average marks of a student in 5 subjects is 80. If he scores 90 in the sixth subject, what is his new average?

A. 81.67

B. 81.33

C. 80.5

D. 82.5

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Sum of 5 =5×80=400. Sum of 6 =400+90=490. New average =490/6=81.666... ≈81.67.

This question belongs to: Maths Average

Average MCQs

More Maths Topics