Find the average of the first 6 multiples of 3. MCQ with Answer and Explanation

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Find the average of the first 6 multiples of 3.

A. 11

B. 9.5

C. 10

D. 10.5

Answer: Option D

Solution (By JKSSB Mock Tests)

Multiples:3,6,9,12,15,18 sum=63, count=6, avg=10.5.

This question belongs to: Maths Average

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Question #1

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Average of 9 numbers 1090. If average of 6 is 1085, average of remaining 3?

A. 1098

B. 1100

C. 1105

D. 1095

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Correct Answer: Option B

Explanation:
Sum9=9810. Sum6=6510. Remaining=3300. Average=1100.

This question belongs to: Maths Average

Question #2

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Average of 10 numbers 1930. If average of 6 is 1925, average of remaining 4?

A. 1937.5

B. 1936

C. 1935

D. 1940

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Correct Answer: Option A

Explanation:
Sum10=19300. Sum6=11550. Remaining=7750. Average=1937.5.

This question belongs to: Maths Average

Question #3

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The average of 9 numbers is 27. If one number is wrongly taken as 45 instead of 27, the incorrect average is:

A. 31

B. 29

C. 28

D. 30

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Correct Answer: Option B

Explanation:
Correct total = 9×27 = 243. Incorrect total = 243+18 = 261. Incorrect average = 261/9 = 29.

This question belongs to: Maths Average

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