Average of 25 students marks 80. If 5 students average 90, average of remaining 20? MCQ with Answer and Explanation

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Average of 25 students marks 80. If 5 students average 90, average of remaining 20?

A. 76

B. 78

C. 77.5

D. 75

Answer: Option C

Solution (By JKExamLibrary)

Total=2000. 5=450. Remaining=1550/20=77.5.

This question belongs to: Maths Average

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Question #1

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The average of 30 numbers is 25. If 5 numbers with average 30 are added, new average?

A. 25

B. 25.71

C. 27

D. 26

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Correct Answer: Option B

Explanation:
Total30=750. Added=150. Total900. Numbers35. Average≈25.71.

This question belongs to: Maths Average

Question #2

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Average of 9 numbers 2190. If average of 6 is 2185, average of remaining 3?

A. 2205

B. 2200

C. 2195

D. 2198

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Correct Answer: Option B

Explanation:
Sum9=19710. Sum6=13110. Remaining=6600. Average=2200.

This question belongs to: Maths Average

Question #3

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Average of 10 numbers 680. If average of 6 is 675, average of remaining 4?

A. 687.5

B. 686

C. 685

D. 690

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Correct Answer: Option A

Explanation:
Sum10=6800. Sum6=4050. Remaining=2750. Average=687.5.

This question belongs to: Maths Average

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