Average of 12 numbers 1220. If average of 8 is 1215, average of remaining 4? MCQ with Answer and Explanation

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Average of 12 numbers 1220. If average of 8 is 1215, average of remaining 4?

A. 1228

B. 1232

C. 1225

D. 1230

Answer: Option D

Solution (By JKExamLibrary)

Sum12=14640. Sum8=9720. Remaining=4920. Average=1230.

This question belongs to: Maths Average

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Question #1 Report Error

What is the average of the squares of first 5 natural numbers?

A. 12

B. 9

C. 10

D. 11

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Correct Answer: Option D

Explanation:
Squares: 1,4,9,16,25 sum=55, average=55/5=11.

This question belongs to: Maths Average

Question #2 Report Error

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

A. 43

B. 38

C. 45

D. 40

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Correct Answer: Option A

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

This question belongs to: Maths Average

Question #3 Report Error

Average of 10 numbers 2030. If average of 6 is 2025, average of remaining 4?

A. 2036

B. 2040

C. 2035

D. 2037.5

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Correct Answer: Option D

Explanation:
Sum10=20300. Sum6=12150. Remaining=8150. Average=2037.5.

This question belongs to: Maths Average

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