Average of 12 numbers 1420. If average of 8 is 1415, average of remaining 4? MCQ with Answer and Explanation

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Average of 12 numbers 1420. If average of 8 is 1415, average of remaining 4?

A. 1432

B. 1425

C. 1430

D. 1428

Answer: Option C

Solution (By JKExamLibrary)

Sum12=17040. Sum8=11320. Remaining=5720. Average=1430.

This question belongs to: Maths Average

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Question #1 Report Error

Average of 12 numbers 55. If average of 8 is 50, average of remaining 4?

A. 70

B. 60

C. 65

D. 62.5

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Correct Answer: Option C

Explanation:
Sum12=660. Sum8=400. Remaining=260. Average=65.

This question belongs to: Maths Average

Question #2 Report Error

What is the average of all odd numbers from 1 to 19?

A. 9

B. 10

C. 9.5

D. 10.5

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Correct Answer: Option B

Explanation:
Odd numbers: 1,3,5,...,19. There are 10 terms. Sum = n^2 =10^2=100. Average=100/10=10.

This question belongs to: Maths Average

Question #3 Report Error

The average of 45 numbers is 50. If 5 numbers average 60 are added, new average of 50 numbers?

A. 50.5

B. 52

C. 51

D. 49

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Correct Answer: Option C

Explanation:
Total45=2250. Added=300. Total2550/50=51.

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