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 #321 Report Error

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

A. 34

B. 32.5

C. 33.33

D. 33

View Answer & Solution Discuss

Correct Answer: Option D

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

This question belongs to: Maths Average

Question #322 Report Error

The average of 10,20,30,40 is

A. 20

B. 35

C. 25

D. 30

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Sum=100. Average=25.

This question belongs to: Maths Average

Question #323 Report Error

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

A. 41

B. 40

C. 40.4

D. 39

View Answer & Solution Discuss

Correct Answer: Option C

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

This question belongs to: Maths Average

Question #324 Report Error

Average of 15,25,35 is

A. 25

B. 30

C. 20

D. 28

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Sum=75. Average=25.

This question belongs to: Maths Average

Question #325 Report Error

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

A. 65

B. 68

C. 69

D. 67

View Answer & Solution Discuss

Correct Answer: Option B

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

This question belongs to: Maths Average

Question #326 Report Error

The average of all natural numbers from 1 to 40 is

A. 21

B. 19.5

C. 20

D. 20.5

View Answer & Solution Discuss

Correct Answer: Option D

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

This question belongs to: Maths Average

Question #327 Report Error

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. 28

B. 32

C. 30

D. 31

View Answer & Solution Discuss

Correct Answer: Option C

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

This question belongs to: Maths Average

Question #328 Report Error

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

A. 60

B. 62

C. 64

D. 58

View Answer & Solution Discuss

Correct Answer: Option B

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

This question belongs to: Maths Average

Question #329 Report Error

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

A. 45

B. 38

C. 42

D. 40

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
Sum=200. Average=40.

This question belongs to: Maths Average

Question #330 Report Error

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. 26

B. 25

C. 27

D. 24

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Net zero change. Average remains 25.

This question belongs to: Maths Average

Question #331 Report Error

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

A. 17

B. 15.6

C. 15.5

D. 16

View Answer & Solution Discuss

Correct Answer: Option D

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

This question belongs to: Maths Average

Question #332 Report Error

Average of 1 to 10 except 5 is

A. 4.5

B. 6

C. 5.5

D. 5

View Answer & Solution Discuss

Correct Answer: Option C

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

This question belongs to: Maths Average

Question #333 Report Error

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

A. 14

B. 15

C. 16

D. 17

View Answer & Solution Discuss

Correct Answer: Option C

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

This question belongs to: Maths Average

Question #334 Report Error

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

A. 40

B. 39

C. 37

D. 38

View Answer & Solution Discuss

Correct Answer: Option D

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

This question belongs to: Maths Average

Question #335 Report Error

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

A. 1:2

B. 2:1

C. 1:1

D. 3:1

View Answer & Solution Discuss

Correct Answer: Option C

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

This question belongs to: Maths Average

Question #336 Report Error

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

A. 21

B. 27

C. 30

D. 24

View Answer & Solution Discuss

Correct Answer: Option B

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 Report Error

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

Correct Answer: Option A

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

This question belongs to: Maths Average

Question #338 Report Error

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

A. 5

B. 1

C. 2 or 0.5

D. 4

View Answer & Solution Discuss

Correct Answer: Option C

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 Report Error

Average of 18, 24, 30, 36 is

A. 30

B. 26

C. 28

D. 27

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
Sum=108. Average=27.

This question belongs to: Maths Average

Question #340 Report Error

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

A. 77

B. 76.25

C. 76

D. 75

View Answer & Solution Discuss

Correct Answer: Option B

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

This question belongs to: Maths Average

More Maths Topics

Compound Interest MCQs

Percentage MCQs

Profit And Loss MCQs

Ratio and Proportion MCQs

Simple Interest MCQs

Time and Work MCQs

Time Speed and Distance MCQs