Average MCQs with Answers and Explanations for Competitive Exams

Question #301

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

A. 21

B. 24

C. 18

D. 15

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #302

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

A. 24

B. 25

C. 26

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

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

A. 18

B. 20

C. 25

D. 22

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Correct Answer: Option B

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

This question belongs to: Maths Average

Question #304

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Average of numbers from 25 to 50 is

A. 37

B. 38

C. 36.5

D. 37.5

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Correct Answer: Option D

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

This question belongs to: Maths Average

Question #305

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

A. 39

B. 38

C. 41

D. 40

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Correct Answer: Option A

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

This question belongs to: Maths Average

Question #306

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

A. 35

B. 40

C. 30

D. 25

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Correct Answer: Option A

Explanation:
Third =75 -40=35.

This question belongs to: Maths Average

Question #307

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

A. 25

B. 23

C. 24

D. 26

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Correct Answer: Option C

Explanation:
Sum=120. Average=24.

This question belongs to: Maths Average

Question #308

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

A. 46

B. 47

C. 50

D. 48

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Correct Answer: Option B

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

This question belongs to: Maths Average

Question #309

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

A. 225

B. 55

C. 50

D. 45

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Correct Answer: Option D

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

This question belongs to: Maths Average

Question #310

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

A. 13

B. 12

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

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

A. 35.56

B. 36

C. 34

D. 35

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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

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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. 21

B. 19

C. 20

D. 22

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Correct Answer: Option C

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

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Average of all prime numbers between 10 and 30 is

A. 21

B. 18

C. 19.5

D. 20

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #314

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Average of 25,35,45,55 is

A. 38

B. 40

C. 45

D. 42

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Correct Answer: Option B

Explanation:
Sum=160. Average=40.

This question belongs to: Maths Average

Question #315

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

A. 49

B. 45

C. 48

D. 47

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #316

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

A. 33

B. 32

C. 31

D. 30

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #317

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

A. 8800

B. 8500

C. 9000

D. 8200

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Correct Answer: Option B

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

This question belongs to: Maths Average

Question #318

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

A. 16

B. 15

C. 14

D. 13

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Correct Answer: Option C

Explanation:
Sum=84. Average=14.

This question belongs to: Maths Average

Question #319

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

A. 26

B. 25.71

C. 27

D. 25

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Correct Answer: Option B

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

This question belongs to: Maths Average

Question #320

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

A. 12

B. 15

C. 16

D. 14

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Correct Answer: Option D

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

This question belongs to: Maths Average

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