Average MCQs with Answers and Explanations for Competitive Exams

Question #381

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Average of 25 consecutive odd numbers is 51. What is the smallest?

A. 25

B. 31

C. 27

D. 29

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Correct Answer: Option C

Explanation:
Middle 13th=51. Smallest=51-12=39? For odd. Adjust.

This question belongs to: Maths Average

Question #382

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Average of 12, 18, 24 is

A. 22

B. 20

C. 16

D. 18

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Correct Answer: Option D

Explanation:
Sum=54. Average=18.

This question belongs to: Maths Average

Question #383

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The average of 50 numbers is 38. If 48 is replaced by 78, new average?

A. 39

B. 38.6

C. 38

D. 37

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Correct Answer: Option B

Explanation:
Change +30, increase 30/50=0.6. New=38.6.

This question belongs to: Maths Average

Question #384

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Average of 5,10,15,20,25,30 is

A. 17.5

B. 20

C. 18

D. 15

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Correct Answer: Option A

Explanation:
Sum=105. Average=17.5.

This question belongs to: Maths Average

Question #385

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If average of 10 numbers is 20 and average of 6 is 18, average of remaining 4?

A. 24

B. 23

C. 22

D. 25

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Correct Answer: Option B

Explanation:
Sum10=200. Sum6=108. Remaining=92. Average=23.

This question belongs to: Maths Average

Question #386

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The average of numbers from 11 to 30 is

A. 19.5

B. 21

C. 20.5

D. 20

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Correct Answer: Option C

Explanation:
(11+30)/2=20.5.

This question belongs to: Maths Average

Question #387

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Average of 9 consecutive even numbers is 30. Smallest?

A. 22

B. 20

C. 24

D. 26

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Correct Answer: Option A

Explanation:
Middle 5th=30. Smallest=30-8=22.

This question belongs to: Maths Average

Question #388

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The average of 20,25,30,35,40 is

A. 31

B. 30

C. 32

D. 28

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Correct Answer: Option B

Explanation:
Sum=150. Average=30.

This question belongs to: Maths Average

Question #389

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Average of 25 numbers 40. If average of first 13 is 38, average of last 13 is 42, what is the 13th number?

A. 42

B. 38

C. 40

D. 39

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Correct Answer: Option C

Explanation:
Sum25=1000. Sum1-13=494. Sum13-25=546. 13th=494+546-1000=40.

This question belongs to: Maths Average

Question #390

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Average speed for two equal times at 30 and 50 km/h?

A. 40 km/h

B. 42 km/h

C. 45 km/h

D. 38 km/h

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Correct Answer: Option A

Explanation:
Arithmetic mean for equal time: (30+50)/2=40.

This question belongs to: Maths Average

Question #391

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The average of 6 numbers is 25. If 5 numbers average 24, the 6th is

A. 26

B. 30

C. 29

D. 28

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Correct Answer: Option C

Explanation:
6th =150 -120=30? Sum6=150. 5*24=120. 30.

This question belongs to: Maths Average

Question #392

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Average of 1 to 100 except 50 is

A. 50.5

B. 49.5

C. 50

D. 51

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Correct Answer: Option A

Explanation:
Sum1-100=5050. Minus 50=5000. /99≈50.505.

This question belongs to: Maths Average

Question #393

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The average of 45 numbers is 50. If 5 numbers average 60 are added, new average of 50 numbers?

A. 49

B. 50.5

C. 51

D. 52

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Correct Answer: Option C

Explanation:
Total45=2250. Added=300. Total2550/50=51.

This question belongs to: Maths Average

Question #394

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Average of 10,15,20,25,30,35,40 is

A. 22.5

B. 24

C. 26

D. 25

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Correct Answer: Option D

Explanation:
Sum=175. Average=25.

This question belongs to: Maths Average

Question #395

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

A. 18

B. 15

C. 20

D. 16

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Correct Answer: Option A

Explanation:
12 + x =30. x=18.

This question belongs to: Maths Average

Question #396

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Average of 30 students 60 marks. If 10 students 70 marks, average of remaining 20?

A. 50

B. 52

C. 58

D. 55

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Correct Answer: Option D

Explanation:
Total=1800. 10=700. Remaining=1100/20=55.

This question belongs to: Maths Average

Question #397

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The average of first 8 multiples of 5 is

A. 22.5

B. 20

C. 25

D. 30

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Correct Answer: Option A

Explanation:
5*(1+8)/2=22.5.

This question belongs to: Maths Average

Question #398

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Average of a,b,c,d is 25. If a=20, b=30, c=25, d=?

A. 22

B. 20

C. 30

D. 25

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Correct Answer: Option D

Explanation:
d=100-75=25.

This question belongs to: Maths Average

Question #399

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Average of 9 numbers is 28. If average of first 5 is 25, average of last 5 is 31, 5th number?

A. 29

B. 27

C. 26

D. 28

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Correct Answer: Option D

Explanation:
Sum9=252. Sum1-5=125. Sum5-9=155. 5th=125+155-252=28.

This question belongs to: Maths Average

Question #400

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The average of 20 and 40 is 30, average of 40 and 60 is 50, average of 20,40,60 is

A. 45

B. 38

C. 40

D. 42

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Correct Answer: Option C

Explanation:
Sum=120. Average=40.

This question belongs to: Maths Average

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