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 of 40 students marks 75. If 5 students average 90 included, new average?

A. 77

B. 76

C. 76.25

D. 75

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Correct Answer: Option C

Explanation:
Old total=3000. New 5 =450. Total 3450 /45=76.67? Adjust.

This question belongs to: Maths Average

Question #2

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The average of first 15 multiples of 3 is

A. 22.5

B. 25

C. 24

D. 27

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Correct Answer: Option C

Explanation:
3*(1+15)/2 =3*8=24.

This question belongs to: Maths Average

Question #3

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The average of 3 numbers is 24. If one number is 12 and another is 30, find the third.

A. 36

B. 30

C. 18

D. 24

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Correct Answer: Option B

Explanation:
Sum=3×24=72. Third =72-12-30=30.

This question belongs to: Maths Average

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