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 #281 Report Error

Average height of 30 boys 160 cm. If 5 more with average 170 cm, new average?

A. 162

B. 161.43

C. 163

D. 160

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Correct Answer: Option B

Explanation:
Total old=4800. New=850. Total 5650 /35≈161.43.

This question belongs to: Maths Average

Question #282 Report Error

The average of 5 numbers is 24. If two numbers 18 and 30 are excluded, average of remaining?

A. 26

B. 25

C. 24

D. 22

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Correct Answer: Option C

Explanation:
Sum5=120. Remaining sum=120-48=72. Average=72/3=24.

This question belongs to: Maths Average

Question #283 Report Error

Average of first 20 multiples of 5 is

A. 55

B. 52.5

C. 50

D. 60

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Correct Answer: Option B

Explanation:
5 to 100. Average 5*(1+20)/2 =5*10.5=52.5.

This question belongs to: Maths Average

Question #284 Report Error

Average of 10 numbers 15. If each multiplied by 3, new average?

A. 45

B. 30

C. 5

D. 15

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Correct Answer: Option A

Explanation:
Multiplied by 3, average 45.

This question belongs to: Maths Average

Question #285 Report Error

The average of 6, 12, 18, 24, 30 is

A. 22

B. 20

C. 15

D. 18

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Correct Answer: Option D

Explanation:
Sum=90. Average=18.

This question belongs to: Maths Average

Question #286 Report Error

If average of 25 students is 50 and average of 15 is 60, average of remaining 10?

A. 30

B. 45

C. 35

D. 40

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Correct Answer: Option C

Explanation:
Sum25=1250. Sum15=900. Remaining sum=350. Average=35.

This question belongs to: Maths Average

Question #287 Report Error

Average age of 40 people 35 years. If 10 more with average 40 join, new average?

A. 36.25

B. 36

C. 35.5

D. 37

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Correct Answer: Option B

Explanation:
Total=1400+400=1800. /50=36.

This question belongs to: Maths Average

Question #288 Report Error

The average of 7 consecutive integers starting from n is 25. What is n?

A. 24

B. 23

C. 21

D. 22

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Correct Answer: Option D

Explanation:
Average = n+3 =25. n=22.

This question belongs to: Maths Average

Question #289 Report Error

Average of 4 numbers is 50. If three are 40,45,55, fourth is

A. 55

B. 60

C. 65

D. 50

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Correct Answer: Option B

Explanation:
Fourth=200-140=60.

This question belongs to: Maths Average

Question #290 Report Error

A person covers 2/3 distance at 30 km/h and 1/3 at 60 km/h. Average speed?

A. 45 km/h

B. 35 km/h

C. 36 km/h

D. 40 km/h

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Let distance 3d. Time = (2d/30) + (d/60) = (4d + d)/60 =5d/60. Average =3d / (5d/60) =36.

This question belongs to: Maths Average

Question #291 Report Error

Average of 100 natural numbers is 50.5. Sum is

A. 5050

B. 4950

C. 5100

D. 5000

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Correct Answer: Option A

Explanation:
Sum =50.5×100=5050.

This question belongs to: Maths Average

Question #292 Report Error

The average marks in English for 30 students 55. If 10 students average 65, average of remaining?

A. 55

B. 48

C. 52

D. 50

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Correct Answer: Option D

Explanation:
Total=1650. 10 students=650. Remaining=1000 for 20. 50.

This question belongs to: Maths Average

Question #293 Report Error

Average of first 10 multiples of 9 is

A. 50

B. 45

C. 54.5

D. 49.5

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Correct Answer: Option D

Explanation:
9*(1+10)/2 =9*5.5=49.5.

This question belongs to: Maths Average

Question #294 Report Error

The average of 8 numbers is 12. If 4 is added to half of them and 4 subtracted from other half, new average?

A. 12

B. 11

C. 14

D. 13

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Net change zero. Average remains 12.

This question belongs to: Maths Average

Question #295 Report Error

Average of 1 to 50 is

A. 25

B. 26

C. 24.5

D. 25.5

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Correct Answer: Option D

Explanation:
(50×51)/2 /50 =25.5.

This question belongs to: Maths Average

Question #296 Report Error

A group of 5 friends average age 25. If one leaves, average becomes 24. Age of person who left?

A. 29

B. 30

C. 31

D. 28

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Sum5=125. Sum4=96. Left=29.

This question belongs to: Maths Average

Question #297 Report Error

Average of even numbers between 1 and 31 is

A. 18

B. 16

C. 17

D. 15

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Correct Answer: Option B

Explanation:
2 to 30, 15 numbers. Average (2+30)/2=16.

This question belongs to: Maths Average

Question #298 Report Error

The average of 9 numbers is 40. If average of 6 is 35, average of remaining 3 is

A. 45

B. 48

C. 50

D. 55

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Correct Answer: Option C

Explanation:
Sum9=360. Sum6=210. Remaining sum=150. Average=50.

This question belongs to: Maths Average

Question #299 Report Error

Average speed for round trip at 40 km/h going and 60 km/h returning?

A. 50 km/h

B. 55 km/h

C. 45 km/h

D. 48 km/h

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
2*40*60/(40+60)=48 km/h.

This question belongs to: Maths Average

Question #300 Report Error

Average of 20 numbers is 45. If 5 numbers with average 50 are removed, new average?

A. 44

B. 43.33

C. 45

D. 42

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Sum20=900. Sum5=250. Remaining sum=650. Numbers15. Average≈43.33.

This question belongs to: Maths Average

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