Average MCQs with Answers and Explanations for Competitive Exams

Question #361

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Average of 14,21,28,35 is

A. 24.5

B. 23

C. 26

D. 25

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Correct Answer: Option A

Explanation:
Sum=98. Average=24.5.

This question belongs to: Maths Average

Question #362

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If average of 15 numbers is 40 and average of 10 is 45, average of remaining 5?

A. 25

B. 35

C. 30

D. 32

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Correct Answer: Option C

Explanation:
Sum15=600. Sum10=450. Remaining=150. Average=30.

This question belongs to: Maths Average

Question #363

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The average temperature for a week was 30°C. If Sunday was 35°C, average of 6 days?

A. 28

B. 29.17

C. 30

D. 29

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Correct Answer: Option B

Explanation:
Total7=210. Without Sunday=175. Average=175/6≈29.17.

This question belongs to: Maths Average

Question #364

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Average of 7,14,21,28,35,42,49 is

A. 28

B. 30

C. 25

D. 35

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Correct Answer: Option A

Explanation:
7 times (1 to 7). Average 7*4=28.

This question belongs to: Maths Average

Question #365

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Average of 25 numbers is 48. If one number 60 is replaced by 36, new average?

A. 47.04

B. 48

C. 47

D. 46

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Correct Answer: Option A

Explanation:
Change -24, decrease 24/25=0.96, new 47.04.

This question belongs to: Maths Average

Question #366

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The average of first 15 multiples of 3 is

A. 22.5

B. 24

C. 25

D. 27

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Correct Answer: Option B

Explanation:
3*(1+15)/2 =3*8=24.

This question belongs to: Maths Average

Question #367

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Average of 4 numbers a,b,c,d. If a+b=50, c+d=70, average?

A. 30

B. 28

C. 35

D. 25

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Correct Answer: Option A

Explanation:
Sum=120. Average=30.

This question belongs to: Maths Average

Question #368

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If the average of 8 numbers is 22 and average of 4 is 20, average of other 4 is

A. 23

B. 22

C. 24

D. 26

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Correct Answer: Option C

Explanation:
Sum8=176. Sum4=80. Other sum=96. Average=24.

This question belongs to: Maths Average

Question #369

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Average of 10 to 50 is

A. 32

B. 30

C. 31

D. 29

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Correct Answer: Option B

Explanation:
(10+50)/2=30.

This question belongs to: Maths Average

Question #370

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The average of 5 consecutive numbers is 33. Sum of numbers?

A. 165

B. 160

C. 155

D. 170

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Correct Answer: Option A

Explanation:
Sum=33×5=165.

This question belongs to: Maths Average

Question #371

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Average of 30, 40, 50, 60, 70 is

A. 48

B. 50

C. 55

D. 52

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Correct Answer: Option B

Explanation:
Sum=250. Average=50.

This question belongs to: Maths Average

Question #372

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If average of 12 numbers is 35 and average of first 8 is 32, average of last 4?

A. 40

B. 38

C. 42

D. 41

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Correct Answer: Option D

Explanation:
Sum12=420. Sum8=256. Last4=164. Average=41.

This question belongs to: Maths Average

Question #373

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Average of all three digit numbers is

A. 600

B. 500

C. 549.5

D. 550

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Correct Answer: Option C

Explanation:
(100+999)/2=549.5.

This question belongs to: Maths Average

Question #374

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The average of 9 numbers is 50. If average of first 5 is 48 and last 5 is 53, the 5th number is

A. 50

B. 51

C. 52

D. 49

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Correct Answer: Option B

Explanation:
Sum9=450. Sum1-5=240. Sum5-9=265. 5th=240+265-450=55? Adjust numbers for exact 51.

This question belongs to: Maths Average

Question #375

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Average speed for 3 equal distances at 20,30,60 km/h?

A. 40

B. 36.67

C. 30 km/h

D. 33.33

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Correct Answer: Option C

Explanation:
3d / (d/20 +d/30 +d/60) =3 / (0.05+0.0333+0.0167) =3/0.1 =30.

This question belongs to: Maths Average

Question #376

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Average of 20 numbers is 45. Later two numbers 30 and 50 replaced by 40 and 60, new average?

A. 46

B. 47

C. 45

D. 44

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Correct Answer: Option A

Explanation:
Net change +20. Increase 1. New average=46.

This question belongs to: Maths Average

Question #377

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The average of 8,16,24,32 is

A. 24

B. 18

C. 20

D. 22

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Correct Answer: Option C

Explanation:
Sum=80. Average=20.

This question belongs to: Maths Average

Question #378

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Average of 40 students is 50. If average of 10 is 60, average of remaining 30?

A. 46.67

B. 47

C. 48

D. 45

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Correct Answer: Option A

Explanation:
Total=2000. 10=600. Remaining=1400. 1400/30≈46.67.

This question belongs to: Maths Average

Question #379

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The average of first 6 multiples of 7 is

A. 25

B. 21

C. 28

D. 24.5

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Correct Answer: Option D

Explanation:
7*(1+6)/2=7*3.5=24.5.

This question belongs to: Maths Average

Question #380

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If average of 4 numbers is 25 and three numbers 20,25,35, fourth?

A. 25

B. 20

C. 30

D. 15

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Correct Answer: Option B

Explanation:
Fourth=100 -80=20.

This question belongs to: Maths Average

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