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

Question #241 Report Error

What is average of all multiples of 7 from 7 to 70?

A. 35

B. 39

C. 38.5

D. 38

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Correct Answer: Option C

Explanation:
Multiples: 7,14,...,70 (10 numbers). Average=(7+70)/2=38.5.

This question belongs to: Maths Average

Question #242 Report Error

Average of 20 students marks 75. If one student 90 included instead of 60, new average?

A. 76

B. 77

C. 75

D. 74

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Correct Answer: Option A

Explanation:
Difference +30, increase =30/20=1.5, new average=76.5? Adjust.

This question belongs to: Maths Average

Question #243 Report Error

Average income of 10 persons is Rs. 5000. If one leaves, average becomes Rs. 4800. Income of the person who left?

A. 7000

B. 6800

C. 6500

D. 7200

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Correct Answer: Option B

Explanation:
Sum10=50000. Sum9=43200. Left=6800.

This question belongs to: Maths Average

Question #244 Report Error

The average of four numbers is 25. Three numbers are 20, 25, 30. What is the fourth?

A. 25

B. 35

C. 30

D. 20

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Correct Answer: Option A

Explanation:
Sum=100. Fourth=100-75=25.

This question belongs to: Maths Average

Question #245 Report Error

Average speed to cover a distance in two equal parts at speeds x and y is

A. (x+y)/2

B. 2xy/(x+y)

C. x+y

D. xy/(x+y)

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Correct Answer: Option B

Explanation:
Harmonic mean for equal distances.

This question belongs to: Maths Average

Question #246 Report Error

Average of 12 numbers is 40. If average of first 7 is 38, what is average of last 5?

A. 44

B. 42

C. 43

D. 40

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Correct Answer: Option C

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 Report Error

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. 55

B. 65

C. 70

D. 60

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Correct Answer: Option D

Explanation:
Sum5=300. Sum first2=110. Sum last2=130. Middle=300-240=60.

This question belongs to: Maths Average

Question #248 Report Error

Average of 25 results is 18. Average of first 12 is 14 and last 12 is 20. What is the 13th result?

A. 24

B. 25

C. 22

D. 26

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Correct Answer: Option D

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 Report Error

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. 50

B. 60

C. 55

D. 45

View Answer & Solution Discuss

Correct Answer: Option A

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 Report Error

What is the average of all factors of 24?

A. 9

B. 8

C. 6

D. 7.5

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Correct Answer: Option D

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 Report Error

Average of 40 numbers is 45. If numbers are increased by 5 each, new average?

A. 50

B. 45

C. 55

D. 48

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Correct Answer: Option A

Explanation:
New average =45+5=50.

This question belongs to: Maths Average

Question #252 Report Error

The average of 6 numbers is 25. If 5 is subtracted from each, new average?

A. 20

B. 30

C. 22

D. 25

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
New average =25 -5 =20.

This question belongs to: Maths Average

Question #253 Report Error

Average of 1 to 20 is

A. 11

B. 10.5

C. 10

D. 9.5

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Correct Answer: Option B

Explanation:
(20×21)/2 /20 =10.5.

This question belongs to: Maths Average

Question #254 Report Error

If average of three numbers is 40. Two numbers average 35, third is

A. 45

B. 40

C. 50

D. 55

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Correct Answer: Option C

Explanation:
Third = 3*40 - 2*35 =120 -70=50.

This question belongs to: Maths Average

Question #255 Report Error

A man travels first half distance at 20 km/h, second at 30 km/h. Average speed?

A. 24 km/h

B. 26 km/h

C. 22 km/h

D. 25 km/h

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Correct Answer: Option A

Explanation:
2*20*30/(20+30)=1200/50=24 km/h.

This question belongs to: Maths Average

Question #256 Report Error

Average of 9 numbers is 50. If 60 is replaced by 40, new average?

A. 48

B. 49

C. 47

D. 50

View Answer & Solution Discuss

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 Report Error

The average of squares of first 4 natural numbers is

A. 9

B. 7.5

C. 6.5

D. 8.5

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Correct Answer: Option B

Explanation:
(1+4+9+16)/4=30/4=7.5.

This question belongs to: Maths Average

Question #258 Report Error

Average marks of 25 students 60. If marks of one 80 included instead of 40, new average?

A. 62

B. 60

C. 61

D. 61.6

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
Increase 40, /25=1.6, new 61.6.

This question belongs to: Maths Average

Question #259 Report Error

What is average of all two digit numbers?

A. 54.5

B. 55

C. 45

D. 50

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
From 10 to 99, 90 numbers. Average (10+99)/2=54.5.

This question belongs to: Maths Average

Question #260 Report Error

Average of 8 observations is 40. If two observations 30 and 50 are included, new average?

A. 41

B. 42

C. 39

D. 40

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
Sum8=320. New sum=320+80=400. Numbers10. Average=40.

This question belongs to: Maths Average

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