The average of 12 numbers is 40. Later average becomes 42 when two numbers are changed. The difference in sum? MCQ with Answer and Explanation

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The average of 12 numbers is 40. Later average becomes 42 when two numbers are changed. The difference in sum?

A. 28

B. 30

C. 20

D. 24

Answer: Option D

Solution (By JKSSB Mock Tests)

Increase in average 2, for 12 =24 increase in sum.

This question belongs to: Maths Average

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Question #1

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Average of 25 numbers 60. If 5 numbers average 70, average of remaining 20?

A. 56

B. 58

C. 57.5

D. 55

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Correct Answer: Option C

Explanation:
Total=1500. 5=350. Remaining=1150/20=57.5.

This question belongs to: Maths Average

Question #2

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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. 52

C. 51

D. 50

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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 #3

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The average of 2 numbers is 15. If one number is 10, what is the other?

A. 20

B. 15

C. 25

D. 5

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Correct Answer: Option A

Explanation:
Sum =2×15=30. Other =30-10=20.

This question belongs to: Maths Average

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