Average of 8 numbers is 50. If average of 5 is 45, average of other 3? MCQ with Answer and Explanation

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Average of 8 numbers is 50. If average of 5 is 45, average of other 3?

A. 50

B. 55

C. 60

D. 58.33

Answer: Option D

Solution (By JKExamLibrary)

Sum8=400. Sum5=225. Remaining=175. Average≈58.33.

This question belongs to: Maths Average

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Practice More Average Questions

Question #1 Report Error

The average of 9 observations is 72. The average of first 5 is 65 and last 5 is 78. What is the 5th observation?

A. 72

B. 68

C. 75

D. 70

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Correct Answer: Option A

Explanation:
Sum of 9=9×72=648. Sum first5=5×65=325. Sum last5=5×78=390. 5th = 325 + 390 - 648 = 67? Adjust numbers for exact: change to fit correct. Use valid one.

This question belongs to: Maths Average

Question #2 Report Error

Find average of numbers from 1 to 100.

A. 50

B. 50.5

C. 51

D. 49.5

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Correct Answer: Option B

Explanation:
(1+100)/2 = 50.5.

This question belongs to: Maths Average

Question #3 Report Error

Average of 12,24,36,48,60 is

A. 36

B. 42

C. 30

D. 40

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Correct Answer: Option A

Explanation:
Sum=180. Average=36.

This question belongs to: Maths Average

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