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 #161 Report Error

The average marks of 25 students is 72. If a student with 60 marks leaves, what is the new average?

A. 72.5

B. 73

C. 72

D. 71.5

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Correct Answer: Option A

Explanation:
Sum=25×72=1800. New sum=1800-60=1740. New avg=1740/24=72.5.

This question belongs to: Maths Average

Question #162 Report Error

The average of 6 numbers is 17. If one number is 20, find the average of the remaining 5.

A. 16.6

B. 17.0

C. 16.4

D. 16.8

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Correct Answer: Option C

Explanation:
Sum=6×17=102. Remaining sum=102-20=82. Avg=82/5=16.4.

This question belongs to: Maths Average

Question #163 Report Error

Find the average of all numbers from 1 to 40 that are divisible by 8.

A. 25

B. 24

C. 22.5

D. 23

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Correct Answer: Option B

Explanation:
Numbers:8,16,24,32,40 sum=120, count=5, avg=24.

This question belongs to: Maths Average

Question #164 Report Error

The average of 4 numbers is 27. If each number is increased by 4, what is the new average?

A. 35

B. 23

C. 31

D. 27

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Correct Answer: Option C

Explanation:
New average =27+4=31.

This question belongs to: Maths Average

Question #165 Report Error

The average of 7 numbers is 30. If each number is divided by 2, what is the new average?

A. 15

B. 16

C. 13

D. 14

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Correct Answer: Option A

Explanation:
New average =30/2=15.

This question belongs to: Maths Average

Question #166 Report Error

The average of 3 numbers is 12. If the numbers are in the ratio 1:2:3, find the smallest.

A. 10

B. 6

C. 8

D. 4

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Correct Answer: Option B

Explanation:
Sum=3×12=36. Ratio sum=6. Smallest = (1/6)×36=6.

This question belongs to: Maths Average

Question #167 Report Error

The average of 10 numbers is 21. If one number is 30, find the average of the remaining 9.

A. 19.5

B. 20

C. 19

D. 20.5

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Correct Answer: Option B

Explanation:
Sum=10×21=210. Remaining sum=210-30=180. Avg=180/9=20.

This question belongs to: Maths Average

Question #168 Report Error

The average of 8 numbers is 34. If each number is multiplied by 1.5, what is the new average?

A. 34

B. 68

C. 25.5

D. 51

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Correct Answer: Option D

Explanation:
New average =34×1.5=51.

This question belongs to: Maths Average

Question #169 Report Error

The average of 5 numbers is 44. If each number is decreased by 6, what is the new average?

A. 50

B. 38

C. 32

D. 44

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Correct Answer: Option B

Explanation:
New average =44-6=38.

This question belongs to: Maths Average

Question #170 Report Error

The average weight of 10 persons is 70 kg. If a person weighing 80 kg leaves, what is the new average?

A. 68.89 kg

B. 69

C. 69.5

D. 68.5

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Correct Answer: Option A

Explanation:
Sum=10×70=700. New sum=700-80=620. New avg=620/9=68.89.

This question belongs to: Maths Average

Question #171 Report Error

The average of 6 numbers is 23. If two numbers are 18 and 26, find the average of the remaining four.

A. 23

B. 22.5

C. 24

D. 23.5

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Correct Answer: Option D

Explanation:
Sum=6×23=138. Sum of two=18+26=44. Sum of four=94. Avg=94/4=23.5.

This question belongs to: Maths Average

Question #172 Report Error

What is the average of the first 10 odd numbers?

A. 10

B. 10.5

C. 11

D. 9.5

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Correct Answer: Option A

Explanation:
Sum of first 10 odd =10^2=100. Average=100/10=10.

This question belongs to: Maths Average

Question #173 Report Error

The average of 4 numbers is 24. If each number is multiplied by 4, what is the new average?

A. 48

B. 24

C. 96

D. 72

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Correct Answer: Option C

Explanation:
New average =24×4=96.

This question belongs to: Maths Average

Question #174 Report Error

The average of 9 numbers is 27. If one number is 36, find the average of the remaining 8.

A. 25.5

B. 26.5

C. 26

D. 25.875

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Correct Answer: Option D

Explanation:
Sum=9×27=243. Remaining sum=243-36=207. Avg=207/8=25.875.

This question belongs to: Maths Average

Question #175 Report Error

Find the average of the first 6 multiples of 5.

A. 18

B. 16.5

C. 17

D. 17.5

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Correct Answer: Option D

Explanation:
Multiples:5,10,15,20,25,30 sum=105, count=6, avg=17.5.

This question belongs to: Maths Average

Question #176 Report Error

The average of 7 numbers is 48. If each number is increased by 7, what is the new average?

A. 48

B. 62

C. 55

D. 41

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
New average =48+7=55.

This question belongs to: Maths Average

Question #177 Report Error

The average of 5 numbers is 24. If each number is divided by 3, what is the new average?

A. 8

B. 6

C. 7

D. 9

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
New average =24/3=8.

This question belongs to: Maths Average

Question #178 Report Error

The average marks of 22 students is 65. If a student with 75 marks leaves and another with 85 joins, what is the new average?

A. 66.0

B. 65.2

C. 65.5

D. 65.45

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
Sum=22×65=1430. Remove 75: 1430-75=1355. Add 85: 1355+85=1440. New avg=1440/22=65.45.

This question belongs to: Maths Average

Question #179 Report Error

The average of 6 numbers is 29. If one number is 34, find the average of the remaining 5.

A. 28.2

B. 28

C. 27.8

D. 27.6

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Correct Answer: Option B

Explanation:
Sum=6×29=174. Remaining sum=174-34=140. Avg=140/5=28.

This question belongs to: Maths Average

Question #180 Report Error

The average of 5 numbers is 24. If one number is excluded, the average of the remaining 4 numbers becomes 20. What is the excluded number?

A. 36

B. 40

C. 48

D. 44

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Total of 5 numbers = 5×24 = 120. Total of remaining 4 numbers = 4×20 = 80. Excluded number = 120−80 = 40.

This question belongs to: Maths Average

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