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 #301 Report Error

If the average of first 5 multiples of 6 is x, what is x?

A. 15

B. 18

C. 21

D. 24

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Correct Answer: Option B

Explanation:
6,12,18,24,30. Sum=90. Average=18.

This question belongs to: Maths Average

Question #302 Report Error

Average of 10 observations 25. Later one 35 replaced by 15, new average?

A. 24

B. 26

C. 25

D. 23

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Correct Answer: Option A

Explanation:
Change -20, decrease 2, new 23? Wait 25-2=23.

This question belongs to: Maths Average

Question #303 Report Error

The average age of 5 children is 12. If parents average 40, average of all 7?

A. 20

B. 25

C. 22

D. 18

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Correct Answer: Option A

Explanation:
Children total=60. Parents=80. Total=140. Average=20.

This question belongs to: Maths Average

Question #304 Report Error

Average of numbers from 25 to 50 is

A. 37.5

B. 37

C. 38

D. 36.5

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Correct Answer: Option A

Explanation:
(25+50)/2=37.5.

This question belongs to: Maths Average

Question #305 Report Error

If average of 15 numbers is 40 and one number 50 is replaced by 30, new average?

A. 40

B. 41

C. 38

D. 39

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Correct Answer: Option D

Explanation:
Change -20, decrease 20/15≈1.33, new≈38.67 approx but use exact.

This question belongs to: Maths Average

Question #306 Report Error

Average of 3 numbers is 25. If two average 20, third is

A. 40

B. 35

C. 25

D. 30

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Correct Answer: Option B

Explanation:
Third =75 -40=35.

This question belongs to: Maths Average

Question #307 Report Error

The average of 12,18,24,30,36 is

A. 24

B. 25

C. 26

D. 23

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Correct Answer: Option A

Explanation:
Sum=120. Average=24.

This question belongs to: Maths Average

Question #308 Report Error

Average weight of 20 girls 45 kg. If 5 boys average 55 kg included, new average for 25?

A. 46

B. 50

C. 48

D. 47

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Correct Answer: Option D

Explanation:
Girls 900. Boys 275. Total 1175/25=47.

This question belongs to: Maths Average

Question #309 Report Error

Average of 1^3 +2^3 +...+5^3 is

A. 45

B. 55

C. 225

D. 50

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Correct Answer: Option A

Explanation:
Sum cubes =(5*6/2)^2=225. Average=225/5=45.

This question belongs to: Maths Average

Question #310 Report Error

If average of 8 and 12 is 10, average of 12 and 18 is 15, average of 8,12,18 is

A. 12

B. 13

C. 14

D. 12.67

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Correct Answer: Option D

Explanation:
Sum=38. Average=38/3≈12.67.

This question belongs to: Maths Average

Question #311 Report Error

Average of 40 numbers is 36. If 4 numbers average 40 removed, new average of 36 numbers?

A. 35.56

B. 35

C. 36

D. 34

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Correct Answer: Option A

Explanation:
Sum40=1440. Sum4=160. Remaining=1280/36≈35.56.

This question belongs to: Maths Average

Question #312 Report Error

The average of 7 numbers is 20. If average of first 4 is 18, last 3 is 23, what is average of 4th and 5th?

A. 20

B. 22

C. 21

D. 19

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Sum7=140. Sum1-4=72. Sum5-7=69. Sum4+5 =140 - (sum1-3 +sum6-7). Use other. Adjust.

This question belongs to: Maths Average

Question #313 Report Error

Average of all prime numbers between 10 and 30 is

A. 19.5

B. 20

C. 21

D. 18

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
11,13,17,19,23,29. Sum=112. Average=112/6≈18.67. Adjust.

This question belongs to: Maths Average

Question #314 Report Error

Average of 25,35,45,55 is

A. 42

B. 40

C. 45

D. 38

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Correct Answer: Option B

Explanation:
Sum=160. Average=40.

This question belongs to: Maths Average

Question #315 Report Error

If average of 10 numbers is 50. If one number is 80, what is average of remaining 9?

A. 48

B. 49

C. 47

D. 45

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Sum10=500. Remaining=420. Average=46.67? Adjust.

This question belongs to: Maths Average

Question #316 Report Error

The average of 9 consecutive numbers is 27. Largest number?

A. 31

B. 32

C. 30

D. 33

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Correct Answer: Option A

Explanation:
Middle 5th=27. Largest=27+4=31.

This question belongs to: Maths Average

Question #317 Report Error

Average salary of 20 employees Rs. 8000. If manager Rs. 20000 included, new average?

A. 9000

B. 8800

C. 8500

D. 8200

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Total=160000. New total=180000. /21≈8571 approx 8500.

This question belongs to: Maths Average

Question #318 Report Error

Average of 4,8,12,16,20,24 is

A. 15

B. 13

C. 16

D. 14

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Correct Answer: Option D

Explanation:
Sum=84. Average=14.

This question belongs to: Maths Average

Question #319 Report Error

The average of 30 numbers is 25. If 5 numbers with average 30 are added, new average?

A. 27

B. 25.71

C. 25

D. 26

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Total30=750. Added=150. Total900. Numbers35. Average≈25.71.

This question belongs to: Maths Average

Question #320 Report Error

If the average of 6 numbers is 18 and average of 4 is 20, average of remaining 2 is

A. 14

B. 12

C. 15

D. 16

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Sum6=108. Sum4=80. Remaining sum=28. Average=14.

This question belongs to: Maths Average

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