Average of 15 numbers 910. If average of 9 is 905, average of remaining 6? MCQ with Answer and Explanation

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Average of 15 numbers 910. If average of 9 is 905, average of remaining 6?

A. 917.5

B. 920

C. 918

D. 915

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum15=13650. Sum9=8145. Remaining=5505. Average=917.5.

This question belongs to: Maths Average

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Question #1

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The average marks of 30 students is 60. If the marks of 10 students are averaged 50, what is the average of the remaining 20 students?

A. 65

B. 60

C. 67.5

D. 62.5

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Correct Answer: Option A

Explanation:
Total sum =30×60=1800. Sum of 10 =10×50=500. Sum of remaining 20 =1800-500=1300. Average =1300/20=65.

This question belongs to: Maths Average

Question #2

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Average of 6 numbers is 8.5. If two numbers 12 and 15 are added, what is the new average?

A. 10

B. 9

C. 9.5

D. 9.75

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Correct Answer: Option D

Explanation:
Sum of 6=51. New sum=51+12+15=78. Numbers=8. Average=78/8=9.75.

This question belongs to: Maths Average

Question #3

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Average of 10 even numbers is 25. What is the largest if they are consecutive?

A. 36

B. 32

C. 34

D. 30

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Correct Answer: Option C

Explanation:
Average middle average of 5th and 6th. Largest =25 +9 =34.

This question belongs to: Maths Average

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