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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Total Questions

Practice Questions

Page 4 of 49
Question #61
The average of 4 numbers is 28. If one number is 32, find the average of the remaining 3.
A. 26.67
B. 28
C. 27
D. 26
Discuss
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Correct Answer: Option A

Explanation:
Sum=4×28=112. Remaining sum=112-32=80. Avg=80/3=26.67.
This question belongs to: Maths Average
Question #62
The average of 7 numbers is 45. If each number is decreased by 3, what is the new average?
A. 45
B. 42
C. 39
D. 48
Discuss
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Correct Answer: Option B

Explanation:
New average =45-3=42.
This question belongs to: Maths Average
Question #63
The average of 11 numbers is 44. What is the sum of the numbers?
A. 440
B. 504
C. 484
D. 464
Discuss
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Correct Answer: Option C

Explanation:
Sum =44×11=484.
This question belongs to: Maths Average
Question #64
The average marks of 20 students is 75. If a student with 90 marks leaves, what is the new average?
A. 74.0
B. 74.21
C. 73.5
D. 75.0
Discuss
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Correct Answer: Option B

Explanation:
Sum=20×75=1500. New sum=1500-90=1410. New average=1410/19=74.21.
This question belongs to: Maths Average
Question #65
The average of 5 numbers is 22. If two numbers are 18 and 24, find the average of the remaining three.
A. 23
B. 21.33
C. 22.67
D. 22
Discuss
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Correct Answer: Option C

Explanation:
Sum=5×22=110. Sum of two=18+24=42. Sum of three=68. Avg=68/3=22.67.
This question belongs to: Maths Average
Question #66
Find the average of the first 7 natural numbers which are multiples of 2.
A. 8
B. 7
C. 8.5
D. 9
Discuss
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Correct Answer: Option A

Explanation:
Multiples: 2,4,6,8,10,12,14 sum=56, count=7, avg=8.
This question belongs to: Maths Average
Question #67
The average of 6 numbers is 30. If each number is multiplied by 1.5, what is the new average?
A. 45
B. 60
C. 22.5
D. 30
Discuss
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Correct Answer: Option A

Explanation:
New average =30×1.5=45.
This question belongs to: Maths Average
Question #68
The average age of 5 persons is 25 years. If one person aged 30 leaves, what is the average of the remaining?
A. 24
B. 24.5
C. 23.5
D. 23.75
Discuss
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Correct Answer: Option D

Explanation:
Sum=5×25=125. New sum=125-30=95. Avg=95/4=23.75.
This question belongs to: Maths Average
Question #69
The average of 8 numbers is 36. If one number is 60, what is the average of the rest?
A. 31.5
B. 32
C. 32.57
D. 33
Discuss
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Correct Answer: Option C

Explanation:
Sum=8×36=288. Rest sum=288-60=228. Avg=228/7=32.57.
This question belongs to: Maths Average
Question #70
What is the average of all numbers from 1 to 50 that are divisible by 7?
A. 28.5
B. 27.5
C. 29
D. 28
Discuss
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Correct Answer: Option D

Explanation:
Numbers: 7,14,21,28,35,42,49. Sum=196, count=7, avg=28.
This question belongs to: Maths Average
Question #71
The average of 4 numbers is 18. If each number is decreased by 6, what is the new average?
A. 18
B. 24
C. 6
D. 12
Discuss
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Correct Answer: Option D

Explanation:
New average =18-6=12.
This question belongs to: Maths Average
Question #72
The average score of a cricketer in 10 innings is 45. If he scores 70 in the next innings, what is his new average?
A. 47.0
B. 47.27
C. 46.5
D. 48.5
Discuss
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Correct Answer: Option B

Explanation:
Sum of 10 =10×45=450. Sum of 11=450+70=520. New average=520/11=47.27.
This question belongs to: Maths Average
Question #73
The average of 5 numbers is 25. If one number is 35, find the average of the remaining 4.
A. 23
B. 24
C. 22.5
D. 22
Discuss
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Correct Answer: Option C

Explanation:
Sum=5×25=125. Remaining sum=125-35=90. Avg=90/4=22.5.
This question belongs to: Maths Average
Question #74
Find the average of the squares of first 4 natural numbers.
A. 6.5
B. 7
C. 7.5
D. 8
Discuss
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Correct Answer: Option C

Explanation:
Squares:1,4,9,16 sum=30, avg=30/4=7.5.
This question belongs to: Maths Average
Question #75
The average of 12 numbers is 18. If each number is increased by 5, what is the new average?
A. 28
B. 13
C. 18
D. 23
Discuss
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Correct Answer: Option D

Explanation:
New average =18+5=23.
This question belongs to: Maths Average
Question #76
The average weight of 6 persons is 65 kg. If a person weighing 80 kg joins, what is the new average?
A. 68 kg
B. 67.5 kg
C. 67.14 kg
D. 66.67 kg
Discuss
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Correct Answer: Option C

Explanation:
Sum=6×65=390. New sum=390+80=470. New avg=470/7=67.14.
This question belongs to: Maths Average
Question #77
The average of 8 numbers is 40. If one number is 20, find the average of the remaining 7.
A. 42.86
B. 43
C. 41.5
D. 42
Discuss
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Correct Answer: Option A

Explanation:
Sum=8×40=320. Remaining sum=320-20=300. Avg=300/7=42.86.
This question belongs to: Maths Average
Question #78
What is the average of the first 6 prime numbers?
A. 7
B. 6.33
C. 6.83
D. 6.5
Discuss
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Correct Answer: Option C

Explanation:
Primes:2,3,5,7,11,13 sum=41, avg=41/6=6.83.
This question belongs to: Maths Average
Question #79
The average of 3 numbers is 20. If the numbers are in the ratio 1:2:3, find the largest.
A. 25
B. 30
C. 20
D. 35
Discuss
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Correct Answer: Option B

Explanation:
Sum=3×20=60. Ratio sum=6. Largest = (3/6)×60=30.
This question belongs to: Maths Average
Question #80
The average of 10 numbers is 12. If each number is divided by 4, what is the new average?
A. 5
B. 2
C. 4
D. 3
Discuss
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Correct Answer: Option D

Explanation:
New average =12/4=3.
This question belongs to: Maths Average

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