Average of 15 numbers 1910. If average of 9 is 1905, average of remaining 6? MCQ with Answer and Explanation

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Average of 15 numbers 1910. If average of 9 is 1905, average of remaining 6?

A. 1915

B. 1918

C. 1920

D. 1917.5

Answer: Option D

Solution (By JKExamLibrary)

Sum15=28650. Sum9=17145. Remaining=11505. Average=1917.5.

This question belongs to: Maths Average

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Question #1 Report Error

The average age of 5 children is 12. If parents average 40, average of all 7?

A. 20

B. 25

C. 22

D. 18

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Correct Answer: Option A

Explanation:
Children total=60. Parents=80. Total=140. Average=20.

This question belongs to: Maths Average

Question #2 Report Error

Average of 10 numbers is 40. If each number is multiplied by 2, what is the new average?

A. 20

B. 40

C. 60

D. 80

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Correct Answer: Option D

Explanation:
If each number is multiplied by a constant, average is also multiplied by the same. New average = 40 × 2 = 80.

This question belongs to: Maths Average

Question #3 Report Error

The average of 3 numbers is 9. If the numbers are in the ratio 2:3:4, find the smallest.

A. 5

B. 8

C. 6

D. 7

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Correct Answer: Option C

Explanation:
Sum=3×9=27. Ratio sum=2+3+4=9. Smallest = (2/9)×27=6.

This question belongs to: Maths Average

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