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 #41 Report Error

The average age of 6 children is 10 years. If the age of one child is 8, find the average age of the remaining 5.

A. 11

B. 10.4

C. 10

D. 9.6

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Correct Answer: Option B

Explanation:
Sum=6×10=60. Remaining sum=60-8=52. Avg=52/5=10.4.

This question belongs to: Maths Average

Question #42 Report Error

The average of 4 numbers is 25. If the numbers are in the ratio 2:3:4:5, find the smallest number.

A. 13.5

B. 14

C. 14.29

D. 15

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Correct Answer: Option C

Explanation:
Sum=4×25=100. Ratio sum=14. Smallest = (2/14)×100 =14.285...≈14.29.

This question belongs to: Maths Average

Question #43 Report Error

The average of 6 numbers is 12. If one number is 20, find the average of the rest.

A. 10

B. 11

C. 9.6

D. 10.4

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Correct Answer: Option D

Explanation:
Sum=6×12=72. Rest sum=72-20=52. Average=52/5=10.4.

This question belongs to: Maths Average

Question #44 Report Error

Find the average of all numbers divisible by 5 between 10 and 30 (inclusive).

A. 20.5

B. 22.5

C. 17.5

D. 20

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Correct Answer: Option D

Explanation:
Numbers: 10,15,20,25,30 sum=100, count=5, avg=20.

This question belongs to: Maths Average

Question #45 Report Error

The average of 8 numbers is 22. If each number is decreased by 2, what is the new average?

A. 22

B. 24

C. 20

D. 18

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Correct Answer: Option C

Explanation:
New average =22-2=20.

This question belongs to: Maths Average

Question #46 Report Error

The average marks of 30 students is 60. If the marks of 10 students are averaged 50, what is the average of the remaining 20 students?

A. 65

B. 67.5

C. 60

D. 62.5

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Correct Answer: Option A

Explanation:
Total sum =30×60=1800. Sum of 10 =10×50=500. Sum of remaining 20 =1800-500=1300. Average =1300/20=65.

This question belongs to: Maths Average

Question #47 Report Error

The average of 5 numbers is 18. If one number is 25 and another is 15, find the average of the remaining 3 numbers.

A. 16.67

B. 16

C. 17

D. 18

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Correct Answer: Option A

Explanation:
Sum=5×18=90. Sum of two=25+15=40. Sum of three=50. Average=50/3=16.67.

This question belongs to: Maths Average

Question #48 Report Error

What is the average of the first 6 multiples of 2?

A. 8

B. 6

C. 9

D. 7

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Correct Answer: Option D

Explanation:
Multiples:2,4,6,8,10,12 sum=42, count=6, avg=7.

This question belongs to: Maths Average

Question #49 Report Error

The average of 7 numbers is 28. If one number is 40, find the average of the remaining 6.

A. 27

B. 26

C. 25

D. 24

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Correct Answer: Option B

Explanation:
Sum=7×28=196. Remaining sum=196-40=156. Average=156/6=26.

This question belongs to: Maths Average

Question #50 Report Error

The average height of 4 boys is 1.5 m. If a girl of height 1.6 m joins, what is the new average?

A. 1.53 m

B. 1.52 m

C. 1.5 m

D. 1.55 m

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Correct Answer: Option B

Explanation:
Sum of 4 =4×1.5=6.0. Sum of 5=6.0+1.6=7.6. Average=7.6/5=1.52.

This question belongs to: Maths Average

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