Average of 30 students 60 marks. If 10 students 70 marks, average of remaining 20? MCQ with Answer and Explanation

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Average of 30 students 60 marks. If 10 students 70 marks, average of remaining 20?

A. 55

B. 58

C. 50

D. 52

Answer: Option A

Solution (By JKSSB Mock Tests)

Total=1800. 10=700. Remaining=1100/20=55.

This question belongs to: Maths Average

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Question #1

Average of 40 numbers 65. If 15 numbers average 70, average of remaining 25?

A. 60

B. 64

C. 62

D. 63

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Correct Answer: Option C

Explanation:
Total=2600. 15=1050. Remaining=1550/25=62.

This question belongs to: Maths Average

Question #2

The average of first 6 multiples of 7 is

A. 28

B. 21

C. 25

D. 24.5

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Correct Answer: Option D

Explanation:
7*(1+6)/2=7*3.5=24.5.

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Question #3

The average of 540,720,900 is

A. 710

B. 730

C. 715

D. 720

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Correct Answer: Option D

Explanation:
2160/3=720.

This question belongs to: Maths Average

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