Average MCQs with Answers and Explanations for Competitive Exams

Question #341

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Average of first 5 prime numbers is

A. 7

B. 5

C. 6

D. 5.6

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Correct Answer: Option D

Explanation:
2+3+5+7+11=28. 28/5=5.6.

This question belongs to: Maths Average

Question #342

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Average of 10 numbers 35. If average of 6 is 30, average of remaining 4?

A. 40

B. 42.5

C. 43

D. 45

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Correct Answer: Option B

Explanation:
Sum10=350. Sum6=180. Remaining=170. Average=42.5.

This question belongs to: Maths Average

Question #343

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The average weight increases by 1 kg when one of 60 kg is replaced by new. For 10 people, new weight?

A. 75

B. 80

C. 70

D. 65

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Correct Answer: Option C

Explanation:
Increase 10*1=10. New weight=60+10=70 kg.

This question belongs to: Maths Average

Question #344

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Average of 21, 28, 35, 42 is

A. 32

B. 33

C. 30

D. 31.5

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Correct Answer: Option D

Explanation:
Sum=126. Average=31.5.

This question belongs to: Maths Average

Question #345

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If average of 5 consecutive multiples of 4 is 32, what is the largest?

A. 44

B. 40

C. 48

D. 36

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Correct Answer: Option B

Explanation:
Numbers 20,24,28,32,36 avg 28 no. 24,28,32,36,40 avg 32. Largest 40.

This question belongs to: Maths Average

Question #346

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Average of 50 and 60 is 55, average of 60 and 70 is 65, average of 50,60,70 is

A. 60

B. 61

C. 59

D. 58.33

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Correct Answer: Option A

Explanation:
Sum=180. Average=60.

This question belongs to: Maths Average

Question #347

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The average of 12 numbers is 40. Later average becomes 42 when two numbers are changed. The difference in sum?

A. 20

B. 24

C. 28

D. 30

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Correct Answer: Option B

Explanation:
Increase in average 2, for 12 =24 increase in sum.

This question belongs to: Maths Average

Question #348

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Average of all numbers from 1 to 25 except multiples of 5 is

A. 12.5

B. 13

C. 15

D. 14

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Correct Answer: Option B

Explanation:
Total sum1-25=325. Multiples5:5+10+15+20+25=75. Remaining sum=250. Numbers20. Average=12.5? Adjust.

This question belongs to: Maths Average

Question #349

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Average of 8 numbers is 50. If average of 5 is 45, average of other 3?

A. 58.33

B. 60

C. 50

D. 55

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Correct Answer: Option A

Explanation:
Sum8=400. Sum5=225. Remaining=175. Average≈58.33.

This question belongs to: Maths Average

Question #350

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The average of 3 numbers is 40. If one number is 30% more than average of other two, find the numbers? But simple: assume values.

A. 25,40,55

B. 30,40,50

C. 35,40,45

D. 36,40,44

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Correct Answer: Option B

Explanation:
Sum=120. Check 30% more.

This question belongs to: Maths Average

Question #351

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Average of 16,24,32,40,48 is

A. 34

B. 32

C. 35

D. 30

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Correct Answer: Option B

Explanation:
Sum=160. Average=32.

This question belongs to: Maths Average

Question #352

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If average of 20 numbers is 30 and 10 numbers average 25, average of remaining 10?

A. 35

B. 32.5

C. 40

D. 30

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Correct Answer: Option A

Explanation:
Sum20=600. Sum10=250. Remaining=350. Average=35.

This question belongs to: Maths Average

Question #353

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The average age of 25 persons is 36. If 5 persons with average 40 leave, new average?

A. 37

B. 35

C. 36

D. 34

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Correct Answer: Option B

Explanation:
Total=900. Leave=200. Remaining 700/20=35.

This question belongs to: Maths Average

Question #354

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Average of first 10 odd numbers is

A. 10

B. 12

C. 11

D. 9

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Correct Answer: Option A

Explanation:
Average =10.

This question belongs to: Maths Average

Question #355

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Average of 45,55,65 is

A. 52

B. 50

C. 55

D. 60

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Correct Answer: Option C

Explanation:
Sum=165. Average=55.

This question belongs to: Maths Average

Question #356

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The average of 6 numbers is 28. If each is increased by 50%, new average?

A. 35

B. 40

C. 28

D. 42

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Correct Answer: Option D

Explanation:
Increased by 50%, average 28*1.5=42.

This question belongs to: Maths Average

Question #357

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Average of numbers divisible by 6 from 6 to 60.

A. 32

B. 33

C. 36

D. 30

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Correct Answer: Option B

Explanation:
6 to 60, 10 numbers. Average (6+60)/2=33.

This question belongs to: Maths Average

Question #358

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If average of a,b,c is 25, b=20, average of a,c?

A. 30

B. 22.5

C. 25

D. 27.5

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Correct Answer: Option D

Explanation:
a+c=75-20=55. Average=27.5.

This question belongs to: Maths Average

Question #359

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Average of 10 consecutive even numbers is 35. Largest number?

A. 44

B. 40

C. 42

D. 46

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Correct Answer: Option A

Explanation:
Average middle of 5th 6th 35. Largest=35+9=44.

This question belongs to: Maths Average

Question #360

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The average of 35 numbers is 25. If 5 numbers average 30 are included, new average of 40?

A. 25

B. 26

C. 24

D. 25.625

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Correct Answer: Option D

Explanation:
Total35=875. Added=150. Total1025/40=25.625.

This question belongs to: Maths Average

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