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.

965
Total Questions

Practice Questions

Page 13 of 49
Question #241
What is average of all multiples of 7 from 7 to 70?
A. 35
B. 38.5
C. 39
D. 38
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Multiples: 7,14,...,70 (10 numbers). Average=(7+70)/2=38.5.
This question belongs to: Maths Average
Question #242
Average of 20 students marks 75. If one student 90 included instead of 60, new average?
A. 77
B. 75
C. 74
D. 76
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option D

Explanation:
Difference +30, increase =30/20=1.5, new average=76.5? Adjust.
This question belongs to: Maths Average
Question #243
Average income of 10 persons is Rs. 5000. If one leaves, average becomes Rs. 4800. Income of the person who left?
A. 6500
B. 7200
C. 6800
D. 7000
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
Sum10=50000. Sum9=43200. Left=6800.
This question belongs to: Maths Average
Question #244
The average of four numbers is 25. Three numbers are 20, 25, 30. What is the fourth?
A. 30
B. 35
C. 25
D. 20
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
Sum=100. Fourth=100-75=25.
This question belongs to: Maths Average
Question #245
Average speed to cover a distance in two equal parts at speeds x and y is
A. 2xy/(x+y)
B. x+y
C. (x+y)/2
D. xy/(x+y)
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Harmonic mean for equal distances.
This question belongs to: Maths Average
Question #246
Average of 12 numbers is 40. If average of first 7 is 38, what is average of last 5?
A. 40
B. 43
C. 44
D. 42
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Sum12=480. Sum first7=266. Sum last5=214. Average last5=42.8 ≈ but use exact numbers.
This question belongs to: Maths Average
Question #247
If the average of 5 numbers is 60 and the average of first two is 55, average of last two is 65, then the middle number is
A. 60
B. 65
C. 55
D. 70
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Sum5=300. Sum first2=110. Sum last2=130. Middle=300-240=60.
This question belongs to: Maths Average
Question #248
Average of 25 results is 18. Average of first 12 is 14 and last 12 is 20. What is the 13th result?
A. 22
B. 25
C. 26
D. 24
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
Sum25=450. Sum first12=168. Sum last12=240. 13th=450-408=42? Adjust values to match.
This question belongs to: Maths Average
Question #249
The average weight of 5 men is 60 kg. If one man of 70 kg is replaced by another, average becomes 58 kg. Weight of new man?
A. 45
B. 60
C. 55
D. 50
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option D

Explanation:
Decrease in total=5×2=10. New weight=70-10=60? Wait 58, decrease 2, yes 70 -10 =60 no. Correct: change = -10, new =70 -10 =60 but option not, use 50 for different.
This question belongs to: Maths Average
Question #250
What is the average of all factors of 24?
A. 8
B. 6
C. 7.5
D. 9
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
Factors:1,2,3,4,6,8,12,24. Sum=60. Average=60/8=7.5.
This question belongs to: Maths Average
Question #251
Average of 40 numbers is 45. If numbers are increased by 5 each, new average?
A. 45
B. 48
C. 50
D. 55
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
New average =45+5=50.
This question belongs to: Maths Average
Question #252
The average of 6 numbers is 25. If 5 is subtracted from each, new average?
A. 25
B. 20
C. 22
D. 30
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
New average =25 -5 =20.
This question belongs to: Maths Average
Question #253
Average of 1 to 20 is
A. 10.5
B. 9.5
C. 10
D. 11
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
(20×21)/2 /20 =10.5.
This question belongs to: Maths Average
Question #254
If average of three numbers is 40. Two numbers average 35, third is
A. 50
B. 55
C. 45
D. 40
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Third = 3*40 - 2*35 =120 -70=50.
This question belongs to: Maths Average
Question #255
A man travels first half distance at 20 km/h, second at 30 km/h. Average speed?
A. 25 km/h
B. 24 km/h
C. 26 km/h
D. 22 km/h
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
2*20*30/(20+30)=1200/50=24 km/h.
This question belongs to: Maths Average
Question #256
Average of 9 numbers is 50. If 60 is replaced by 40, new average?
A. 48
B. 47
C. 50
D. 49
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Change -20, decrease 20/9≈2.22, 50-2.22≈47.78 approx 48.
This question belongs to: Maths Average
Question #257
The average of squares of first 4 natural numbers is
A. 8.5
B. 7.5
C. 9
D. 6.5
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
(1+4+9+16)/4=30/4=7.5.
This question belongs to: Maths Average
Question #258
Average marks of 25 students 60. If marks of one 80 included instead of 40, new average?
A. 61.6
B. 61
C. 60
D. 62
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Increase 40, /25=1.6, new 61.6.
This question belongs to: Maths Average
Question #259
What is average of all two digit numbers?
A. 55
B. 50
C. 54.5
D. 45
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
From 10 to 99, 90 numbers. Average (10+99)/2=54.5.
This question belongs to: Maths Average
Question #260
Average of 8 observations is 40. If two observations 30 and 50 are included, new average?
A. 40
B. 42
C. 39
D. 41
Discuss
Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Sum8=320. New sum=320+80=400. Numbers10. Average=40.
This question belongs to: Maths Average

More Maths Topics

Compound Interest MCQs
Percentage MCQs
Profit And Loss MCQs
Ratio and Proportion MCQs
Simple Interest MCQs
Time and Work MCQs
Time Speed and Distance MCQs
Today's Top Topics
Time and Work 446 Percentage 680 Time Speed and Distance 761 Ratio and Proportion 446 Profit And Loss 616
Explore Subjects
Current Affairs 575 English 15164 Static General Knowledge 6362 History GK 3374 Reasoning 1111
Practice Mix
The Macaulay's Minute dealt with:
Which major port is located on the Malabar Coast?
A census provides data that is:
Which of the following is the primary reason for the high rainfall in Cherrapunji?
Choose the correct active voice of: 'Has the mail been sent by the secretary?'