Average of 12 numbers 420. If average of 8 is 415, average of remaining 4? MCQ with Answer and Explanation

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Average of 12 numbers 420. If average of 8 is 415, average of remaining 4?

A. 432

B. 430

C. 428

D. 425

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum12=5040. Sum8=3320. Remaining=1720. Average=430.

This question belongs to: Maths Average

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Question #1

What is the average of all numbers from 1 to 50 that are divisible by 7?

A. 28.5

B. 29

C. 27.5

D. 28

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Correct Answer: Option D

Explanation:
Numbers: 7,14,21,28,35,42,49. Sum=196, count=7, avg=28.

This question belongs to: Maths Average

Question #2

Average of 65,130,195 is

A. 140

B. 130

C. 120

D. 125

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Correct Answer: Option B

Explanation:
390/3=130.

This question belongs to: Maths Average

Question #3

The average marks of 12 students is 72. If a student with 88 marks leaves, what is the new average?

A. 70.55

B. 70

C. 71.5

D. 71

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Correct Answer: Option A

Explanation:
Sum=12×72=864. New sum=864-88=776. New avg=776/11=70.545≈70.55.

This question belongs to: Maths Average

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