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 #381 Report Error

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

A. 27

B. 31

C. 29

D. 25

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Correct Answer: Option A

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

This question belongs to: Maths Average

Question #382 Report Error

Average of 12, 18, 24 is

A. 16

B. 22

C. 20

D. 18

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Correct Answer: Option D

Explanation:
Sum=54. Average=18.

This question belongs to: Maths Average

Question #383 Report Error

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

A. 39

B. 38.6

C. 37

D. 38

View Answer & Solution Discuss

Correct Answer: Option B

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

This question belongs to: Maths Average

Question #384 Report Error

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

A. 20

B. 15

C. 18

D. 17.5

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Correct Answer: Option D

Explanation:
Sum=105. Average=17.5.

This question belongs to: Maths Average

Question #385 Report Error

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

A. 23

B. 25

C. 22

D. 24

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Correct Answer: Option A

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

This question belongs to: Maths Average

Question #386 Report Error

The average of numbers from 11 to 30 is

A. 21

B. 20

C. 19.5

D. 20.5

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Correct Answer: Option D

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

This question belongs to: Maths Average

Question #387 Report Error

Average of 9 consecutive even numbers is 30. Smallest?

A. 24

B. 22

C. 20

D. 26

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Correct Answer: Option B

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

This question belongs to: Maths Average

Question #388 Report Error

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

A. 30

B. 28

C. 31

D. 32

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Correct Answer: Option A

Explanation:
Sum=150. Average=30.

This question belongs to: Maths Average

Question #389 Report Error

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

A. 38

B. 39

C. 42

D. 40

View Answer & Solution Discuss

Correct Answer: Option D

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

This question belongs to: Maths Average

Question #390 Report Error

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

A. 42 km/h

B. 45 km/h

C. 40 km/h

D. 38 km/h

View Answer & Solution Discuss

Correct Answer: Option C

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

This question belongs to: Maths Average

Question #391 Report Error

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

A. 30

B. 28

C. 29

D. 26

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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 Report Error

Average of 1 to 100 except 50 is

A. 51

B. 50.5

C. 49.5

D. 50

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Correct Answer: Option B

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

This question belongs to: Maths Average

Question #393 Report Error

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

A. 49

B. 52

C. 51

D. 50.5

View Answer & Solution Discuss

Correct Answer: Option C

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

This question belongs to: Maths Average

Question #394 Report Error

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

A. 22.5

B. 25

C. 26

D. 24

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Sum=175. Average=25.

This question belongs to: Maths Average

Question #395 Report Error

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

A. 20

B. 18

C. 15

D. 16

View Answer & Solution Discuss

Correct Answer: Option B

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

This question belongs to: Maths Average

Question #396 Report Error

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

A. 52

B. 50

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 Report Error

The average of first 8 multiples of 5 is

A. 25

B. 30

C. 22.5

D. 20

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #398 Report Error

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

A. 25

B. 22

C. 30

D. 20

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
d=100-75=25.

This question belongs to: Maths Average

Question #399 Report Error

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

A. 27

B. 28

C. 29

D. 26

View Answer & Solution Discuss

Correct Answer: Option B

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

This question belongs to: Maths Average

Question #400 Report Error

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

A. 42

B. 45

C. 40

D. 38

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Sum=120. Average=40.

This question belongs to: Maths Average

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