Average MCQs with Answers and Explanations for Competitive Exams

Question #401

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Average of 15 numbers 45. If one number 60 is excluded, new average?

A. 46

B. 44

C. 43

D. 45

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Correct Answer: Option B

Explanation:
Sum15=675. Remaining=615/14≈43.93 approx 44.

This question belongs to: Maths Average

Question #402

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Average of 4 consecutive numbers is 49.5. Largest number?

A. 49

B. 50

C. 52

D. 51

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Correct Answer: Option D

Explanation:
Average middle of 2nd 3rd 49.5. Largest=49.5+1.5=51.

This question belongs to: Maths Average

Question #403

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The average of 35,42,49,56 is

A. 44

B. 46

C. 45.5

D. 47

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Correct Answer: Option C

Explanation:
Sum=182. Average=45.5.

This question belongs to: Maths Average

Question #404

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Average of 12 numbers 40. If average of 8 is 38, average of remaining 4?

A. 45

B. 44

C. 42

D. 46

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Correct Answer: Option B

Explanation:
Sum12=480. Sum8=304. Remaining=176. Average=44.

This question belongs to: Maths Average

Question #405

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The average age of 10 friends is 25. If one 30 years old joins, new average?

A. 24.5

B. 25.5

C. 26

D. 25.45

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Correct Answer: Option D

Explanation:
Total=250. New=280/11≈25.45.

This question belongs to: Maths Average

Question #406

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Average of 18,27,36 is

A. 24

B. 30

C. 27

D. 25

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Correct Answer: Option C

Explanation:
Sum=81. Average=27.

This question belongs to: Maths Average

Question #407

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If average of 5 numbers is 36 and average of 3 is 30, average of remaining 2?

A. 48

B. 45

C. 40

D. 42

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Correct Answer: Option B

Explanation:
Sum5=180. Sum3=90. Remaining=90. Average=45.

This question belongs to: Maths Average

Question #408

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The average of first 20 natural numbers is

A. 10

B. 10.5

C. 11

D. 9.5

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Correct Answer: Option B

Explanation:
(20+1)/2=10.5.

This question belongs to: Maths Average

Question #409

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Average of 50 numbers 20. If numbers are decreased by 2 each, new average?

A. 19

B. 20

C. 18

D. 22

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Correct Answer: Option C

Explanation:
New average=20-2=18.

This question belongs to: Maths Average

Question #410

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The average of 24,36,48 is

A. 38

B. 36

C. 30

D. 35

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Correct Answer: Option B

Explanation:
Sum=108. Average=36.

This question belongs to: Maths Average

Question #411

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Average of 25 students marks 80. If 5 students average 90, average of remaining 20?

A. 76

B. 77.5

C. 75

D. 78

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Correct Answer: Option B

Explanation:
Total=2000. 5=450. Remaining=1550/20=77.5.

This question belongs to: Maths Average

Question #412

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Average of 6 consecutive multiples of 9 is 45. Smallest?

A. 27

B. 45

C. 18

D. 36

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Correct Answer: Option A

Explanation:
Numbers 27,36,45,54,63,72. Avg 49.5 no. Adjust.

This question belongs to: Maths Average

Question #413

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The average of 10, 20, 30 is 20, average of 30,40,50 is 40, average of 10,20,30,40,50 is

A. 28

B. 35

C. 32

D. 30

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Correct Answer: Option D

Explanation:
Sum=150. Average=30.

This question belongs to: Maths Average

Question #414

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Average of 15 numbers 28. If one number 40 is replaced by 25, new average?

A. 28

B. 26.67

C. 27.5

D. 27

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Correct Answer: Option D

Explanation:
Change -15, decrease 1. New=27.

This question belongs to: Maths Average

Question #415

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The average of first 5 even numbers is

A. 7

B. 5

C. 6

D. 8

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Correct Answer: Option C

Explanation:
2+4+6+8+10=30. Average=6.

This question belongs to: Maths Average

Question #416

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Average of 40 numbers 35. If 10 numbers average 40 added, new average?

A. 35

B. 36

C. 36.25

D. 37

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Correct Answer: Option B

Explanation:
Total40=1400. Added=400. Total1800/50=36.

This question belongs to: Maths Average

Question #417

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Average of 21,35,49 is

A. 30

B. 32

C. 35

D. 40

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Correct Answer: Option C

Explanation:
Sum=105. Average=35.

This question belongs to: Maths Average

Question #418

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If average of 9 numbers is 30 and average of 6 is 28, average of remaining 3?

A. 34

B. 33

C. 35

D. 32

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Correct Answer: Option A

Explanation:
Sum9=270. Sum6=168. Remaining=102. Average=34.

This question belongs to: Maths Average

Question #419

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The average of 100 numbers is 50. The number 100 was misread as 10. Correct average?

A. 51

B. 50

C. 50.9

D. 49

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Correct Answer: Option C

Explanation:
Error -90. Increase 90/100=0.9. New=50.9.

This question belongs to: Maths Average

Question #420

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Average of 4,8,12,...,36 is

A. 24

B. 18

C. 22

D. 20

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Correct Answer: Option D

Explanation:
9 numbers. Average=(4+36)/2=20.

This question belongs to: Maths Average

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