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.

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Question #11 Report Error

The average of a set of 8 numbers is 32. If one number is 50, what is the average of the remaining numbers?

A. 28.57

B. 31.00

C. 29.43

D. 30.25

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Correct Answer: Option C

Explanation:
Sum of 8 = 256. Sum of remaining 7 = 256-50=206. Average = 206/7 ≈ 29.43.

This question belongs to: Maths Average

Question #12 Report Error

What is the average of the first 5 multiples of 3?

A. 8

B. 12

C. 10

D. 9

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Correct Answer: Option D

Explanation:
Multiples: 3,6,9,12,15 sum=45, average=45/5=9.

This question belongs to: Maths Average

Question #13 Report Error

The average of 11 numbers is 55. What is the sum of the numbers?

A. 600

B. 550

C. 615

D. 605

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Correct Answer: Option D

Explanation:
Sum = Average × Number =55×11=605.

This question belongs to: Maths Average

Question #14 Report Error

The average of 15 observations is 20. If each observation is increased by 3, what is the new average?

A. 23

B. 30

C. 20

D. 17

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Correct Answer: Option A

Explanation:
New average = old average + increase =20+3=23.

This question belongs to: Maths Average

Question #15 Report Error

The average age of a family of 5 members is 30 years. The youngest member is 5 years old. What is the average age of the remaining 4 members?

A. 36.25

B. 35

C. 34

D. 37.5

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Correct Answer: Option A

Explanation:
Sum of ages = 5×30=150. Sum of remaining 4 =150-5=145. Average =145/4=36.25.

This question belongs to: Maths Average

Question #16 Report Error

The average of 6 numbers is 22. If one number is 10, find the average of the remaining 5 numbers.

A. 24.4

B. 23.6

C. 22.8

D. 25

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Correct Answer: Option A

Explanation:
Sum of 6 = 6×22=132. Sum of 5 =132-10=122. Average =122/5=24.4.

This question belongs to: Maths Average

Question #17 Report Error

What is the average of the first 7 multiples of 5?

A. 25

B. 30

C. 20

D. 15

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Correct Answer: Option C

Explanation:
Multiples: 5,10,15,20,25,30,35 sum=140, count=7, avg=20.

This question belongs to: Maths Average

Question #18 Report Error

The average of 4 numbers is 30. If the numbers are in the ratio 1:2:3:4, find the largest number.

A. 60

B. 48

C. 24

D. 36

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Correct Answer: Option B

Explanation:
Sum = 4×30=120. Ratio sum =1+2+3+4=10. Largest = (4/10)×120=48.

This question belongs to: Maths Average

Question #19 Report Error

The average of 5 consecutive even numbers is 12. What is the smallest number?

A. 12

B. 8

C. 6

D. 10

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Correct Answer: Option B

Explanation:
In consecutive even numbers, average = middle number. So middle (3rd) =12. Smallest =12-4=8.

This question belongs to: Maths Average

Question #20 Report Error

The average marks of 25 students is 70. If the marks of one student were misread as 80 instead of 60, find the correct average.

A. 69.8

B. 70.0

C. 68.8

D. 69.2

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Correct Answer: Option D

Explanation:
Total sum misread =25×70=1750. Correct sum =1750 -80 +60 =1730. Correct average =1730/25=69.2.

This question belongs to: Maths Average

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