The average of 5 numbers is 20. If each number is divided by 2, what is the new average? MCQ with Answer and Explanation

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The average of 5 numbers is 20. If each number is divided by 2, what is the new average?

A. 5

B. 15

C. 10

D. 20

Answer: Option C

Solution (By JKSSB Mock Tests)

New average =20/2=10.

This question belongs to: Maths Average

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Question #1

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

A. 35

B. 39

C. 38.5

D. 38

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #2

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Average of 20 numbers 180. If average of 12 is 175, average of remaining 8?

A. 190

B. 187.5

C. 185

D. 188

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Correct Answer: Option B

Explanation:
Sum20=3600. Sum12=2100. Remaining=1500. Average=187.5.

This question belongs to: Maths Average

Question #3

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What is the average of the first 11 multiples of 3?

A. 19

B. 16.5

C. 17

D. 18

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Correct Answer: Option D

Explanation:
Multiples: 3,6,9,...,33. Sum = 3×(1+2+...+11) = 3×66=198. Count=11. Average=198/11=18.

This question belongs to: Maths Average

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