The average of first 20 natural numbers is MCQ with Answer and Explanation

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The average of first 20 natural numbers is

A. 9.5

B. 11

C. 10

D. 10.5

Answer: Option D

Solution (By JKSSB Mock Tests)

(20+1)/2=10.5.

This question belongs to: Maths Average

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Question #1

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The average of 10 numbers is 25. If one number is removed, the average becomes 23. What is the removed number?

A. 45

B. 38

C. 40

D. 43

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Correct Answer: Option D

Explanation:
Sum of 10 =250. Sum of 9 =9×23=207. Removed number =250-207=43.

This question belongs to: Maths Average

Question #2

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Average of 12 numbers 2670. If average of 8 is 2665, average of remaining 4?

A. 2675

B. 2680

C. 2682

D. 2678

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Correct Answer: Option B

Explanation:
Sum12=32040. Sum8=21320. Remaining=10720. Average=2680.

This question belongs to: Maths Average

Question #3

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The average of 63,72,81 is

A. 68

B. 72

C. 75

D. 70

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Correct Answer: Option B

Explanation:
216/3=72.

This question belongs to: Maths Average

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