The average of 10,20,30,40 is MCQ with Answer and Explanation

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The average of 10,20,30,40 is

A. 20

B. 25

C. 30

D. 35

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum=100. Average=25.

This question belongs to: Maths Average

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Question #1

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The average of 6 numbers is 21. If one number is 15, find the average of the remaining 5.

A. 21.6

B. 22.2

C. 22

D. 21.4

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Correct Answer: Option B

Explanation:
Sum=6×21=126. Remaining sum=126-15=111. Avg=111/5=22.2.

This question belongs to: Maths Average

Question #2

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The average of 5 numbers is 28. If one number is excluded, the average becomes 25. What is the excluded number?

A. 30

B. 40

C. 35

D. 45

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Correct Answer: Option B

Explanation:
Sum of 5 numbers = 5 × 28 = 140. Sum of remaining 4 numbers = 4 × 25 = 100. Excluded number = 140 - 100 = 40.

This question belongs to: Maths Average

Question #3

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Average of 8 numbers 2650. If average of 5 is 2645, average of remaining 3?

A. 2657

B. 2655

C. 2658.33

D. 2660

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Correct Answer: Option C

Explanation:
Sum8=21200. Sum5=13225. Remaining=7975. Average≈2658.33.

This question belongs to: Maths Average

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