Average MCQs with Answers and Explanations for Competitive Exams

Question #281

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

A. 161.43

B. 163

C. 160

D. 162

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Correct Answer: Option A

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

This question belongs to: Maths Average

Question #282

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

A. 25

B. 22

C. 24

D. 26

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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

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Average of first 20 multiples of 5 is

A. 55

B. 52.5

C. 60

D. 50

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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

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

A. 30

B. 5

C. 15

D. 45

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Correct Answer: Option D

Explanation:
Multiplied by 3, average 45.

This question belongs to: Maths Average

Question #285

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

A. 18

B. 20

C. 22

D. 15

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Correct Answer: Option A

Explanation:
Sum=90. Average=18.

This question belongs to: Maths Average

Question #286

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

A. 35

B. 45

C. 30

D. 40

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Correct Answer: Option A

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

This question belongs to: Maths Average

Question #287

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

A. 37

B. 36.25

C. 35.5

D. 36

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Correct Answer: Option D

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

This question belongs to: Maths Average

Question #288

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

A. 22

B. 21

C. 23

D. 24

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Correct Answer: Option A

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

This question belongs to: Maths Average

Question #289

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

A. 50

B. 65

C. 55

D. 60

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Correct Answer: Option D

Explanation:
Fourth=200-140=60.

This question belongs to: Maths Average

Question #290

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

A. 36 km/h

B. 40 km/h

C. 45 km/h

D. 35 km/h

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Correct Answer: Option A

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

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Average of 100 natural numbers is 50.5. Sum is

A. 5050

B. 4950

C. 5000

D. 5100

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Correct Answer: Option A

Explanation:
Sum =50.5×100=5050.

This question belongs to: Maths Average

Question #292

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

A. 48

B. 52

C. 50

D. 55

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #293

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Average of first 10 multiples of 9 is

A. 50

B. 45

C. 49.5

D. 54.5

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #294

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

A. 13

B. 11

C. 12

D. 14

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Correct Answer: Option C

Explanation:
Net change zero. Average remains 12.

This question belongs to: Maths Average

Question #295

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Average of 1 to 50 is

A. 26

B. 24.5

C. 25.5

D. 25

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Correct Answer: Option C

Explanation:
(50×51)/2 /50 =25.5.

This question belongs to: Maths Average

Question #296

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

A. 30

B. 31

C. 28

D. 29

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Correct Answer: Option D

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

This question belongs to: Maths Average

Question #297

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Average of even numbers between 1 and 31 is

A. 15

B. 18

C. 16

D. 17

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #298

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

A. 45

B. 50

C. 48

D. 55

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Correct Answer: Option B

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

This question belongs to: Maths Average

Question #299

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

A. 50 km/h

B. 45 km/h

C. 48 km/h

D. 55 km/h

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #300

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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

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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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