Average of 12 numbers 320. If average of 8 is 315, average of remaining 4? MCQ with Answer and Explanation

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Average of 12 numbers 320. If average of 8 is 315, average of remaining 4?

A. 325

B. 330

C. 332

D. 328

Answer: Option B

Solution (By JKExamLibrary)

Sum12=3840. Sum8=2520. Remaining=1320. Average=330.

This question belongs to: Maths Average

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Question #1

Average of 1605,2140,2675 is

A. 2140

B. 2135

C. 2150

D. 2130

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Correct Answer: Option A

Explanation:
6420/3=2140.

This question belongs to: Maths Average

Question #2

Find the average of the squares of first 4 natural numbers.

A. 8

B. 7

C. 7.5

D. 6.5

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Correct Answer: Option C

Explanation:
Squares:1,4,9,16 sum=30, avg=30/4=7.5.

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Question #3

Average of 10 numbers 680. If average of 6 is 675, average of remaining 4?

A. 685

B. 690

C. 686

D. 687.5

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Correct Answer: Option D

Explanation:
Sum10=6800. Sum6=4050. Remaining=2750. Average=687.5.

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