What is average of all multiples of 7 from 7 to 70? MCQ with Answer and Explanation

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What is average of all multiples of 7 from 7 to 70?

A. 39

B. 38.5

C. 35

D. 38

Answer: Option B

Solution (By JKSSB Mock Tests)

Multiples: 7,14,...,70 (10 numbers). Average=(7+70)/2=38.5.

This question belongs to: Maths Average

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Question #1

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Average of 20 numbers is 45. If 5 numbers with average 50 are removed, new average?

A. 44

B. 42

C. 45

D. 43.33

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Correct Answer: Option D

Explanation:
Sum20=900. Sum5=250. Remaining sum=650. Numbers15. Average≈43.33.

This question belongs to: Maths Average

Question #2

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Average of all three digit numbers is

A. 550

B. 549.5

C. 600

D. 500

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Correct Answer: Option B

Explanation:
(100+999)/2=549.5.

This question belongs to: Maths Average

Question #3

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Average of 10 numbers 2280. If average of 6 is 2275, average of remaining 4?

A. 2285

B. 2287.5

C. 2286

D. 2290

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Correct Answer: Option B

Explanation:
Sum10=22800. Sum6=13650. Remaining=9150. Average=2287.5.

This question belongs to: Maths Average

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