Average of 20 numbers is 45. Later two numbers 30 and 50 replaced by 40 and 60, new average? MCQ with Answer and Explanation

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Average of 20 numbers is 45. Later two numbers 30 and 50 replaced by 40 and 60, new average?

A. 46

B. 47

C. 44

D. 45

Answer: Option A

Solution (By JKSSB Mock Tests)

Net change +20. Increase 1. New average=46.

This question belongs to: Maths Average

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Question #1

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The average age of a family of 5 members is 30 years. The youngest member is 5 years old. What is the average age of the remaining 4 members?

A. 35

B. 36.25

C. 37.5

D. 34

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Correct Answer: Option B

Explanation:
Sum of ages = 5×30=150. Sum of remaining 4 =150-5=145. Average =145/4=36.25.

This question belongs to: Maths Average

Question #2

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The average of 1140,1520,1900 is

A. 1530

B. 1515

C. 1510

D. 1520

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Correct Answer: Option D

Explanation:
4560/3=1520.

This question belongs to: Maths Average

Question #3

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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. 26

B. 24

C. 25

D. 27

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Correct Answer: Option C

Explanation:
Net zero change. Average remains 25.

This question belongs to: Maths Average

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