Average of 50 numbers 40. If two numbers 30 and 50 are replaced by 40 and 60, new average? MCQ with Answer and Explanation

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Average of 50 numbers 40. If two numbers 30 and 50 are replaced by 40 and 60, new average?

A. 39

B. 40

C. 41

D. 40.4

Answer: Option D

Solution (By JKSSB Mock Tests)

Net change +20, increase 20/50=0.4, new 40.4.

This question belongs to: Maths Average

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Question #1

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The average of 45 numbers is 50. If 5 numbers average 60 are added, new average of 50 numbers?

A. 50.5

B. 52

C. 49

D. 51

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Correct Answer: Option D

Explanation:
Total45=2250. Added=300. Total2550/50=51.

This question belongs to: Maths Average

Question #2

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Average of 10 numbers 130. If average of 6 is 125, average of remaining 4?

A. 138

B. 140

C. 135

D. 137.5

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Correct Answer: Option D

Explanation:
Sum10=1300. Sum6=750. Remaining=550. Average=137.5.

This question belongs to: Maths Average

Question #3

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Average of 8 numbers 1150. If average of 5 is 1145, average of remaining 3?

A. 1158.33

B. 1157

C. 1155

D. 1160

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Correct Answer: Option A

Explanation:
Sum8=9200. Sum5=5725. Remaining=3475. Average≈1158.33.

This question belongs to: Maths Average

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