Average MCQs

Maths

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.

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Practice Questions

Page 6 of 49
Question #101
The average of 3 numbers is 9. If the numbers are in the ratio 2:3:4, find the smallest.
A. 8
B. 6
C. 5
D. 7
Discuss
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Correct Answer: Option B

Explanation:
Sum=3×9=27. Ratio sum=2+3+4=9. Smallest = (2/9)×27=6.
This question belongs to: Maths Average
Question #102
The average of 10 numbers is 22. If each number is decreased by 2, what is the new average?
A. 22
B. 18
C. 20
D. 24
Discuss
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Correct Answer: Option C

Explanation:
New average =22-2=20.
This question belongs to: Maths Average
Question #103
The average weight of 8 students is 42 kg. If a new student joins, the average becomes 44 kg. What is the weight of the new student?
A. 62 kg
B. 60 kg
C. 58 kg
D. 56 kg
Discuss
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Correct Answer: Option B

Explanation:
Sum of 8 =8×42=336. Sum of 9 =9×44=396. New student's weight =396-336=60.
This question belongs to: Maths Average
Question #104
The average of 5 numbers is 30. If each number is multiplied by 1.2, what is the new average?
A. 30
B. 24
C. 42
D. 36
Discuss
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Correct Answer: Option D

Explanation:
New average =30×1.2=36.
This question belongs to: Maths Average
Question #105
The average marks of 12 students is 72. If a student with 88 marks leaves, what is the new average?
A. 71.5
B. 70.55
C. 70
D. 71
Discuss
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Correct Answer: Option B

Explanation:
Sum=12×72=864. New sum=864-88=776. New avg=776/11=70.545≈70.55.
This question belongs to: Maths Average
Question #106
The average of 7 numbers is 26. If one number is 32, find the average of the remaining 6.
A. 25.5
B. 24.5
C. 25
D. 26
Discuss
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Correct Answer: Option C

Explanation:
Sum=7×26=182. Remaining sum=182-32=150. Avg=150/6=25.
This question belongs to: Maths Average
Question #107
What is the average of the first 12 even numbers?
A. 12.5
B. 13.5
C. 13
D. 14
Discuss
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Correct Answer: Option C

Explanation:
Sum of first 12 even numbers = 12×13 =156 (since sum = n(n+1) for first n evens). Average=156/12=13.
This question belongs to: Maths Average
Question #108
The average of 4 numbers is 22. If each number is increased by 3, what is the new average?
A. 19
B. 22
C. 28
D. 25
Discuss
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Correct Answer: Option D

Explanation:
New average =22+3=25.
This question belongs to: Maths Average
Question #109
The average of 6 numbers is 14. If each number is divided by 2, what is the new average?
A. 9
B. 6
C. 8
D. 7
Discuss
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Correct Answer: Option D

Explanation:
New average =14/2=7.
This question belongs to: Maths Average
Question #110
The average of 3 numbers is 28. If two numbers are 25 and 30, find the third.
A. 29
B. 26
C. 27
D. 31
Discuss
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Correct Answer: Option A

Explanation:
Sum=3×28=84. Third =84-25-30=29.
This question belongs to: Maths Average
Question #111
The average of 5 numbers is 40. If one number is 60, find the average of the remaining 4.
A. 33.75
B. 34
C. 35
D. 36
Discuss
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Correct Answer: Option C

Explanation:
Sum=5×40=200. Remaining sum=200-60=140. Avg=140/4=35.
This question belongs to: Maths Average
Question #112
The average of 6 numbers is 25. If each number is increased by 8, what is the new average?
A. 17
B. 25
C. 41
D. 33
Discuss
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Correct Answer: Option D

Explanation:
New average =25+8=33.
This question belongs to: Maths Average
Question #113
The average of 8 numbers is 30. If one number is 40, find the average of the remaining 7.
A. 28
B. 28.57
C. 29
D. 27.5
Discuss
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Correct Answer: Option B

Explanation:
Sum=8×30=240. Remaining sum=240-40=200. Avg=200/7=28.57.
This question belongs to: Maths Average
Question #114
Find the average of the first 10 multiples of 2.
A. 12
B. 11.5
C. 11
D. 10
Discuss
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Correct Answer: Option C

Explanation:
Multiples: 2,4,6,...,20 sum=110, count=10, avg=11.
This question belongs to: Maths Average
Question #115
The average of 7 numbers is 29. If each number is multiplied by 3, what is the new average?
A. 58
B. 87
C. 29
D. 86
Discuss
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Correct Answer: Option B

Explanation:
New average =29×3=87.
This question belongs to: Maths Average
Question #116
The average of 4 numbers is 18. If one number is 22, find the average of the remaining 3.
A. 16.67
B. 17
C. 16
D. 17.33
Discuss
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Correct Answer: Option A

Explanation:
Sum=4×18=72. Remaining sum=72-22=50. Avg=50/3=16.67.
This question belongs to: Maths Average
Question #117
The average of 9 numbers is 42. If each number is decreased by 6, what is the new average?
A. 36
B. 30
C. 42
D. 48
Discuss
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Correct Answer: Option A

Explanation:
New average =42-6=36.
This question belongs to: Maths Average
Question #118
The average of 5 numbers is 28. If one number is 34, find the average of the remaining 4.
A. 25.5
B. 26
C. 26.5
D. 27
Discuss
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Correct Answer: Option C

Explanation:
Sum=5×28=140. Remaining sum=140-34=106. Avg=106/4=26.5.
This question belongs to: Maths Average
Question #119
What is the average of the first 8 odd numbers?
A. 7.5
B. 8.5
C. 8
D. 9
Discuss
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Correct Answer: Option C

Explanation:
Sum of first n odd = n^2 =64. Average=64/8=8.
This question belongs to: Maths Average
Question #120
The average of 3 numbers is 15. If each number is multiplied by 2, what is the new average?
A. 30
B. 60
C. 15
D. 45
Discuss
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Correct Answer: Option A

Explanation:
New average =15×2=30.
This question belongs to: Maths Average

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