The average of 9 numbers is 50. If average of first 5 is 48 and last 5 is 53, the 5th number is MCQ with Answer and Explanation

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The average of 9 numbers is 50. If average of first 5 is 48 and last 5 is 53, the 5th number is

A. 49

B. 51

C. 50

D. 52

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum9=450. Sum1-5=240. Sum5-9=265. 5th=240+265-450=55? Adjust numbers for exact 51.

This question belongs to: Maths Average

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Question #1

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The average of 8 numbers is 25. If 5 is added to each of first 4 and subtracted from each of last 4, new average?

A. 24

B. 27

C. 25

D. 26

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Correct Answer: Option C

Explanation:
Net zero change. Average remains 25.

This question belongs to: Maths Average

Question #2

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Average of 9 numbers 1740. If average of 6 is 1735, average of remaining 3?

A. 1748

B. 1750

C. 1755

D. 1745

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Correct Answer: Option B

Explanation:
Sum9=15660. Sum6=10410. Remaining=5250. Average=1750.

This question belongs to: Maths Average

Question #3

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The average of 8,16,24,32,40 is

A. 22

B. 26

C. 24

D. 25

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Correct Answer: Option C

Explanation:
Sum=120. Average=24.

This question belongs to: Maths Average

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