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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Page 8 of 49
Question #141
The average of 8 numbers is 31. If each number is increased by 3, what is the new average?
A. 28
B. 31
C. 37
D. 34
Discuss
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Correct Answer: Option D

Explanation:
New average =31+3=34.
This question belongs to: Maths Average
Question #142
The average marks of 18 students is 68. If a student with 82 marks joins, what is the new average?
A. 69.0
B. 68.74
C. 68.2
D. 68.5
Discuss
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Correct Answer: Option B

Explanation:
Sum=18×68=1224. New sum=1224+82=1306. New avg=1306/19=68.74.
This question belongs to: Maths Average
Question #143
The average of 7 numbers is 39. If one number is 48, find the average of the remaining 6.
A. 37.5
B. 38
C. 36.5
D. 37
Discuss
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Correct Answer: Option A

Explanation:
Sum=7×39=273. Remaining sum=273-48=225. Avg=225/6=37.5.
This question belongs to: Maths Average
Question #144
Find the average of the first 5 multiples of 7.
A. 20
B. 19.5
C. 22
D. 21
Discuss
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Correct Answer: Option D

Explanation:
Multiples:7,14,21,28,35 sum=105, count=5, avg=21.
This question belongs to: Maths Average
Question #145
The average of 4 numbers is 30. If each number is divided by 3, what is the new average?
A. 12
B. 10
C. 9
D. 11
Discuss
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Correct Answer: Option B

Explanation:
New average =30/3=10.
This question belongs to: Maths Average
Question #146
The average of 9 numbers is 50. If one number is 70, find the average of the remaining 8.
A. 47.5
B. 47
C. 48
D. 46.5
Discuss
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Correct Answer: Option A

Explanation:
Sum=9×50=450. Remaining sum=450-70=380. Avg=380/8=47.5.
This question belongs to: Maths Average
Question #147
The average of 6 numbers is 28. If two numbers are 22 and 30, find the average of the remaining four.
A. 29.5
B. 28
C. 29
D. 28.5
Discuss
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Correct Answer: Option C

Explanation:
Sum=6×28=168. Sum of two=22+30=52. Sum of four=116. Avg=116/4=29.
This question belongs to: Maths Average
Question #148
What is the average of all numbers from 1 to 30 that are divisible by 6?
A. 17.5
B. 17
C. 18.5
D. 18
Discuss
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Correct Answer: Option D

Explanation:
Numbers:6,12,18,24,30 sum=90, count=5, avg=18.
This question belongs to: Maths Average
Question #149
The average of 10 numbers is 19. If each number is increased by 6, what is the new average?
A. 19
B. 31
C. 13
D. 25
Discuss
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Correct Answer: Option D

Explanation:
New average =19+6=25.
This question belongs to: Maths Average
Question #150
The average of 5 numbers is 33. If each number is decreased by 2, what is the new average?
A. 31
B. 35
C. 33
D. 29
Discuss
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Correct Answer: Option A

Explanation:
New average =33-2=31.
This question belongs to: Maths Average
Question #151
The average weight of 6 boys is 50 kg. If a new boy weighing 60 kg joins, what is the new average?
A. 51 kg
B. 51.43 kg
C. 50.5 kg
D. 52 kg
Discuss
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Correct Answer: Option B

Explanation:
Sum=6×50=300. New sum=300+60=360. New avg=360/7=51.43.
This question belongs to: Maths Average
Question #152
The average of 7 numbers is 41. If each number is multiplied by 2, what is the new average?
A. 61.5
B. 84
C. 82
D. 41
Discuss
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Correct Answer: Option C

Explanation:
New average =41×2=82.
This question belongs to: Maths Average
Question #153
The average of 3 numbers is 26. If the numbers are in the ratio 1:3:5, find the middle number.
A. 24
B. 28
C. 26
D. 22
Discuss
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Correct Answer: Option C

Explanation:
Sum=3×26=78. Ratio sum=1+3+5=9. Middle = (3/9)×78=26.
This question belongs to: Maths Average
Question #154
The average of 8 numbers is 44. If one number is 56, find the average of the remaining 7.
A. 43
B. 42.29
C. 41.5
D. 42
Discuss
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Correct Answer: Option B

Explanation:
Sum=8×44=352. Remaining sum=352-56=296. Avg=296/7=42.29.
This question belongs to: Maths Average
Question #155
Find the average of the first 7 multiples of 4.
A. 16
B. 14.5
C. 17
D. 15
Discuss
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Correct Answer: Option A

Explanation:
Multiples:4,8,12,16,20,24,28 sum=112, count=7, avg=16.
This question belongs to: Maths Average
Question #156
The average of 6 numbers is 32. If each number is increased by 5, what is the new average?
A. 32
B. 37
C. 42
D. 27
Discuss
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Correct Answer: Option B

Explanation:
New average =32+5=37.
This question belongs to: Maths Average
Question #157
The average of 4 numbers is 19. If each number is multiplied by 3 and then 2 is added, what is the new average?
A. 55
B. 59
C. 61
D. 57
Discuss
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Correct Answer: Option B

Explanation:
New average = (19×3)+2 =57+2=59.
This question belongs to: Maths Average
Question #158
The average of 5 numbers is 29. If one number is 35, find the average of the remaining 4.
A. 27.5
B. 27
C. 26.5
D. 28
Discuss
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Correct Answer: Option A

Explanation:
Sum=5×29=145. Remaining sum=145-35=110. Avg=110/4=27.5.
This question belongs to: Maths Average
Question #159
What is the average of the first 5 composite numbers?
A. 7.2
B. 7.4
C. 7.6
D. 8.0
Discuss
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Correct Answer: Option B

Explanation:
First 5 composites: 4,6,8,9,10 sum=37, avg=37/5=7.4.
This question belongs to: Maths Average
Question #160
The average of 9 numbers is 35. If each number is decreased by 5, what is the new average?
A. 30
B. 35
C. 25
D. 40
Discuss
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Correct Answer: Option A

Explanation:
New average =35-5=30.
This question belongs to: Maths Average

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