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 5 of 49
Question #81
The average of 4 numbers is 16. If one number is 24, find the average of the other three.
A. 12
B. 14
C. 13
D. 13.33
Discuss
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Correct Answer: Option D

Explanation:
Sum=4×16=64. Other sum=64-24=40. Avg=40/3=13.33.
This question belongs to: Maths Average
Question #82
Find the average of the first 5 multiples of 6.
A. 16
B. 18
C. 20
D. 15
Discuss
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Correct Answer: Option B

Explanation:
Multiples:6,12,18,24,30 sum=90, count=5, avg=18.
This question belongs to: Maths Average
Question #83
The average of 7 numbers is 32. If each number is increased by 4, what is the new average?
A. 32
B. 40
C. 28
D. 36
Discuss
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Correct Answer: Option D

Explanation:
New average =32+4=36.
This question belongs to: Maths Average
Question #84
The average marks of 15 students is 80. If a student with 95 marks leaves, what is the new average?
A. 79.5
B. 78.93
C. 79
D. 78.5
Discuss
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Correct Answer: Option B

Explanation:
Sum=15×80=1200. New sum=1200-95=1105. New avg=1105/14=78.93.
This question belongs to: Maths Average
Question #85
The average of 5 numbers is 34. If two numbers are 28 and 32, find the average of the remaining three.
A. 36
B. 36.67
C. 35.33
D. 37
Discuss
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Correct Answer: Option B

Explanation:
Sum=5×34=170. Sum of two=28+32=60. Sum of three=110. Avg=110/3=36.67.
This question belongs to: Maths Average
Question #86
What is the average of all even numbers from 2 to 30?
A. 16.5
B. 16
C. 15.5
D. 15
Discuss
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Correct Answer: Option B

Explanation:
Even numbers: 2 to 30 inclusive. Number of terms = (30-2)/2+1=15. Sum = n/2*(first+last) =15/2*(2+30)=15/2*32=240. Average=240/15=16.
This question belongs to: Maths Average
Question #87
The average of 6 numbers is 20. If one number is 10, find the average of the rest.
A. 20.5
B. 22
C. 21.5
D. 21
Discuss
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Correct Answer: Option B

Explanation:
Sum=6×20=120. Rest sum=120-10=110. Avg=110/5=22.
This question belongs to: Maths Average
Question #88
The average of 4 numbers is 12. If each number is multiplied by 2 and then 5 is added, what is the new average?
A. 30
B. 24
C. 29
D. 27
Discuss
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Correct Answer: Option C

Explanation:
New average = (12×2)+5 =24+5=29.
This question belongs to: Maths Average
Question #89
The average of 9 numbers is 25. If one number is 45, find the average of the remaining 8.
A. 23
B. 22.5
C. 24
D. 22
Discuss
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Correct Answer: Option B

Explanation:
Sum=9×25=225. Remaining sum=225-45=180. Avg=180/8=22.5.
This question belongs to: Maths Average
Question #90
The average of 5 numbers is 18. If each number is multiplied by 3, what is the new average?
A. 54
B. 45
C. 36
D. 60
Discuss
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Correct Answer: Option A

Explanation:
New average =18×3=54.
This question belongs to: Maths Average
Question #91
The average of 8 numbers is 27. If each number is decreased by 4, what is the new average?
A. 27
B. 23
C. 19
D. 31
Discuss
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Correct Answer: Option B

Explanation:
New average =27-4=23.
This question belongs to: Maths Average
Question #92
The average of 10 numbers is 18. If one number is 28, what is the average of the remaining 9?
A. 16.5
B. 16.89
C. 17.0
D. 17.5
Discuss
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Correct Answer: Option B

Explanation:
Sum=10×18=180. Remaining sum=180-28=152. Avg=152/9=16.89.
This question belongs to: Maths Average
Question #93
The average of 6 numbers is 15. If each number is increased by 7, what is the new average?
A. 15
B. 8
C. 22
D. 29
Discuss
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Correct Answer: Option C

Explanation:
New average =15+7=22.
This question belongs to: Maths Average
Question #94
The average of 5 numbers is 36. If one number is 42, find the average of the remaining 4.
A. 33.75
B. 34
C. 35
D. 34.5
Discuss
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Correct Answer: Option D

Explanation:
Sum=5×36=180. Remaining sum=180-42=138. Avg=138/4=34.5.
This question belongs to: Maths Average
Question #95
What is the average of the first 11 multiples of 3?
A. 18
B. 16.5
C. 17
D. 19
Discuss
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Correct Answer: Option A

Explanation:
Multiples: 3,6,9,...,33. Sum = 3×(1+2+...+11) = 3×66=198. Count=11. Average=198/11=18.
This question belongs to: Maths Average
Question #96
The average of 7 numbers is 33. If each number is multiplied by 2 and then 3 is subtracted, what is the new average?
A. 57
B. 66
C. 63
D. 60
Discuss
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Correct Answer: Option C

Explanation:
New average = (33×2) -3 =66-3=63.
This question belongs to: Maths Average
Question #97
The average of 4 numbers is 20. If each number is increased by 5, what is the new average?
A. 20
B. 15
C. 25
D. 30
Discuss
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Correct Answer: Option C

Explanation:
New average =20+5=25.
This question belongs to: Maths Average
Question #98
The average of 9 numbers is 28. If one number is 50, find the average of the remaining 8.
A. 26
B. 24.75
C. 25.5
D. 25.25
Discuss
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Correct Answer: Option D

Explanation:
Sum=9×28=252. Remaining sum=252-50=202. Avg=202/8=25.25.
This question belongs to: Maths Average
Question #99
Find the average of all numbers from 1 to 20 that are divisible by 4.
A. 12
B. 12.5
C. 13
D. 11
Discuss
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Correct Answer: Option A

Explanation:
Numbers: 4,8,12,16,20 sum=60, count=5, avg=12.
This question belongs to: Maths Average
Question #100
The average of 6 numbers is 21. If one number is 15, find the average of the remaining 5.
A. 21.6
B. 22
C. 22.2
D. 21.4
Discuss
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Correct Answer: Option C

Explanation:
Sum=6×21=126. Remaining sum=126-15=111. Avg=111/5=22.2.
This question belongs to: Maths Average

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