Average of 10 numbers 30. If two numbers 20 and 40 replaced by 25 and 35, new average? MCQ with Answer and Explanation

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Average of 10 numbers 30. If two numbers 20 and 40 replaced by 25 and 35, new average?

A. 31

B. 30

C. 29

D. 28

Answer: Option B

Solution (By JKSSB Mock Tests)

Net change 0. Average remains 30.

This question belongs to: Maths Average

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Question #1

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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. 52

B. 50

C. 51

D. 49

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #2

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The average of 4 numbers is 25. If the numbers are in the ratio 2:3:4:5, find the smallest number.

A. 13.5

B. 14

C. 14.29

D. 15

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Correct Answer: Option C

Explanation:
Sum=4×25=100. Ratio sum=14. Smallest = (2/14)×100 =14.285...≈14.29.

This question belongs to: Maths Average

Question #3

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Average of 8 numbers 800. If average of 5 is 795, average of remaining 3?

A. 805

B. 810

C. 807

D. 808.33

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Correct Answer: Option D

Explanation:
Sum8=6400. Sum5=3975. Remaining=2425. Average≈808.33.

This question belongs to: Maths Average

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