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 #261 Report Error

The average age of father and son is 30. If father is 45, son's age?

A. 20

B. 15

C. 10

D. 25

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Correct Answer: Option B

Explanation:
Sum =60. Son=60-45=15.

This question belongs to: Maths Average

Question #262 Report Error

Average of 10 even numbers is 25. What is the largest if they are consecutive?

A. 30

B. 36

C. 32

D. 34

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Correct Answer: Option D

Explanation:
Average middle average of 5th and 6th. Largest =25 +9 =34.

This question belongs to: Maths Average

Question #263 Report Error

If average of a and b is 10, b and c is 15, c and a is 20, average of a,b,c is

A. 14

B. 13

C. 16

D. 15

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Correct Answer: Option D

Explanation:
Adding all: 2(a+b+c)=90, a+b+c=45. Average=15.

This question belongs to: Maths Average

Question #264 Report Error

Average of 50 numbers is 38. The number 45 was wrongly written as 54. Correct average?

A. 37.82

B. 39

C. 37.8

D. 38

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Correct Answer: Option A

Explanation:
Error +9, decrease 9/50=0.18, correct average=38-0.18=37.82.

This question belongs to: Maths Average

Question #265 Report Error

Find average of 11,22,33,...,99.

A. 50

B. 45

C. 55

D. 60

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Correct Answer: Option C

Explanation:
11 times (1 to 9). Average 11×5=55.

This question belongs to: Maths Average

Question #266 Report Error

Average weight of 40 students 45 kg. If 10 more with average 50 kg join, new average?

A. 46

B. 45

C. 46.25

D. 47

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Correct Answer: Option A

Explanation:
Total old=1800. New=500. Total 2300 for 50. Average=46.

This question belongs to: Maths Average

Question #267 Report Error

The average of 5 consecutive even numbers is 28. Smallest number?

A. 24

B. 26

C. 20

D. 22

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Correct Answer: Option A

Explanation:
Average middle=28. Smallest =28-4=24.

This question belongs to: Maths Average

Question #268 Report Error

A library has average 120 books per shelf for 10 shelves. If one shelf has 150, what is average of remaining?

A. 116.67

B. 118

C. 115

D. 120

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Correct Answer: Option A

Explanation:
Total=1200. Remaining=1050 for 9. 1050/9≈116.67.

This question belongs to: Maths Average

Question #269 Report Error

Average of 4 numbers a,b,c,d is 20. If a=15, b=25, average of c,d?

A. 22.5

B. 20

C. 25

D. 18

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
c+d=80 -40=40. Average=20.

This question belongs to: Maths Average

Question #270 Report Error

What is the average of cubes of first 3 natural numbers?

A. 9

B. 12

C. 27

D. 36

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
(1+8+27)/3=36/3=12? Wait, adjust: (1+8+27)=36, 36/3=12.

This question belongs to: Maths Average

Question #271 Report Error

Average of 15 numbers 25. If each increased by 3, new average?

A. 28

B. 27

C. 25

D. 26

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
New average =25+3=28.

This question belongs to: Maths Average

Question #272 Report Error

Average age of 8 persons is 35. If two persons aged 40 and 30 leave, new average?

A. 34

B. 35

C. 36

D. 37

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Correct Answer: Option B

Explanation:
Total=280. Leave 70. Remaining 210 for 6. 35.

This question belongs to: Maths Average

Question #273 Report Error

Average of 1,3,5,...,19 (odd numbers).

A. 12

B. 10

C. 9

D. 11

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
10 terms, average 10.

This question belongs to: Maths Average

Question #274 Report Error

If average of 20 numbers is 50 and 25 is added to each, new average is

A. 55

B. 75

C. 60

D. 50

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
New average =50 +25=75.

This question belongs to: Maths Average

Question #275 Report Error

The average score of 40 matches is 50. If average of first 20 is 45, average of last 20?

A. 50

B. 52

C. 55

D. 48

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Total=2000. First=900. Last=1100. Average=55.

This question belongs to: Maths Average

Question #276 Report Error

Average of a,b is 10, average of b,c is 12, average of c,a is 14. Find a.

A. 8

B. 14

C. 12

D. 10

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
a+b=20, b+c=24, c+a=28. Add all 2(a+b+c)=72, a+b+c=36. a=36-24=12.

This question belongs to: Maths Average

Question #277 Report Error

Average of 9 consecutive odd numbers is 27. What is the smallest?

A. 19

B. 23

C. 21

D. 17

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Middle=27. Smallest=27 -8=19.

This question belongs to: Maths Average

Question #278 Report Error

A team has average 25 runs per player for 11 players. One scores 40, what is average of remaining?

A. 22

B. 23.6

C. 24

D. 25

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Total=275. Remaining =235 for 10. 23.5 ≈23.6.

This question belongs to: Maths Average

Question #279 Report Error

Average of numbers divisible by 3 between 20 and 50.

A. 36

B. 33

C. 37

D. 35

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
21,24,...,48. 10 terms. Average=(21+48)/2=34.5? Adjust.

This question belongs to: Maths Average

Question #280 Report Error

If the average of 12 numbers is 30 and average of 8 is 35, average of remaining 4 is

A. 22.5

B. 25

C. 20

D. 18

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Sum12=360. Sum8=280. Remaining sum=80. Average=20.

This question belongs to: Maths Average

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