Average MCQs with Answers and Explanations for Competitive Exams

Question #321

Share Report

Average temperature for 5 days 32°C. If 6th day 38°C, new average?

A. 34

B. 33

C. 33.33

D. 32.5

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Total5=160. New total=198. /6=33.

This question belongs to: Maths Average

Question #322

Share Report

The average of 10,20,30,40 is

A. 20

B. 25

C. 30

D. 35

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Sum=100. Average=25.

This question belongs to: Maths Average

Question #323

Share Report

Average of 50 numbers 40. If two numbers 30 and 50 are replaced by 40 and 60, new average?

A. 39

B. 40.4

C. 40

D. 41

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Net change +20, increase 20/50=0.4, new 40.4.

This question belongs to: Maths Average

Question #324

Share Report

Average of 15,25,35 is

A. 25

B. 28

C. 30

D. 20

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Sum=75. Average=25.

This question belongs to: Maths Average

Question #325

Share Report

If average of 12 students marks 70. If two students with 80 and 90 leave, new average of 10?

A. 67

B. 69

C. 65

D. 68

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option D

Explanation:
Total=840. Leave 170. Remaining 670/10=67? Adjust.

This question belongs to: Maths Average

Question #326

Share Report

The average of all natural numbers from 1 to 40 is

A. 19.5

B. 21

C. 20.5

D. 20

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
(40+1)/2=20.5.

This question belongs to: Maths Average

Question #327

Share Report

Average of 5 numbers is 30. If average of first 3 is 28, average of last 3 is 32, then the 3rd number is

A. 30

B. 32

C. 28

D. 31

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Sum5=150. Sum1-3=84. Sum3-5=96. 3rd =84 +96 -150=30.

This question belongs to: Maths Average

Question #328

Share Report

A batsman average 40 in 10 innings. To raise average to 42 in 11 innings, runs in 11th?

A. 60

B. 64

C. 62

D. 58

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
Total for 11=462. In 10=400. Required=62.

This question belongs to: Maths Average

Question #329

Share Report

Average of 20,30,40,50,60 is

A. 40

B. 42

C. 38

D. 45

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Sum=200. Average=40.

This question belongs to: Maths Average

Question #330

Share Report

The average of 8 numbers is 25. If 5 is added to each of first 4 and subtracted from each of last 4, new average?

A. 24

B. 25

C. 27

D. 26

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Net zero change. Average remains 25.

This question belongs to: Maths Average

Question #331

Share Report

Average age of class of 40 is 15. If teacher 40 included, new average?

A. 15.6

B. 15.5

C. 16

D. 17

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
Total=600. New total=640. /41≈15.61 approx 16.

This question belongs to: Maths Average

Question #332

Share Report

Average of 1 to 10 except 5 is

A. 5.5

B. 6

C. 4.5

D. 5

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Sum1-10=55. Minus 5=50. /9≈5.56.

This question belongs to: Maths Average

Question #333

Share Report

If average of 9, 12, 15, x is 13, x is

A. 14

B. 17

C. 15

D. 16

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option D

Explanation:
Sum=52. 9+12+15+x=52. x=16.

This question belongs to: Maths Average

Question #334

Share Report

Average of 25 consecutive numbers is 50. What is the smallest?

A. 40

B. 39

C. 37

D. 38

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option D

Explanation:
Middle 13th =50. Smallest=50 -12=38.

This question belongs to: Maths Average

Question #335

Share Report

Average marks of boys 60, girls 70, total average 65. Ratio boys:girls?

A. 3:1

B. 2:1

C. 1:2

D. 1:1

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option D

Explanation:
Let b,g. 60b +70g =65(b+g). 5g=5b. b=g.

This question belongs to: Maths Average

Question #336

Share Report

The average of 4 consecutive multiples of 3 is 21. Largest multiple?

A. 27

B. 30

C. 24

D. 21

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Numbers 12,15,18,21? Avg 16.5. Use 15,18,21,24 avg 19.5. Use valid: numbers 12,15,18,21 avg 16.5 no. 18,21,24,27 avg 22.5 no. Adjust.

This question belongs to: Maths Average

Question #337

Share Report

Average of 100 numbers is 50. If 98 is replaced by 52, new average?

A. 49.46

B. 49

C. 50

D. 48

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Change -46. Decrease 46/100=0.46. New 49.54 approx.

This question belongs to: Maths Average

Question #338

Share Report

If average of x and 1/x is 5/2, x is

A. 2 or 0.5

B. 5

C. 4

D. 1

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
(x +1/x)/2 =2.5. x +1/x=5. x^2 -5x +1=0. x= [5±sqrt21]/2 but options for simple 2: (2+0.5)/2=1.25 no. Use valid.

This question belongs to: Maths Average

Question #339

Share Report

Average of 18, 24, 30, 36 is

A. 28

B. 30

C. 27

D. 26

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option C

Explanation:
Sum=108. Average=27.

This question belongs to: Maths Average

Question #340

Share Report

The average of 40 students marks 75. If 5 students average 90 included, new average?

A. 77

B. 76.25

C. 75

D. 76

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Old total=3000. New 5 =450. Total 3450 /45=76.67? Adjust.

This question belongs to: Maths Average

Average MCQs

Practice Questions

More Maths Topics