If average of 12 numbers is 35 and average of first 8 is 32, average of last 4? MCQ with Answer and Explanation

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If average of 12 numbers is 35 and average of first 8 is 32, average of last 4?

A. 40

B. 41

C. 38

D. 42

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum12=420. Sum8=256. Last4=164. Average=41.

This question belongs to: Maths Average

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Question #1

The average of 18,36,54 is

A. 36

B. 32

C. 40

D. 30

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Correct Answer: Option A

Explanation:
108/3=36.

This question belongs to: Maths Average

Question #2

Average of 15 numbers is 40. Average of first 8 is 35. Average of last 8 is 45. Find the 8th number.

A. 45

B. 42

C. 35

D. 40

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Correct Answer: Option D

Explanation:
Sum15=600. Sum first8=280. Sum last8=360. 8th =280 +360 -600 =40.

This question belongs to: Maths Average

Question #3

Average of 10 numbers 30. If two numbers 20 and 40 replaced by 25 and 35, new average?

A. 30

B. 31

C. 29

D. 28

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Correct Answer: Option A

Explanation:
Net change 0. Average remains 30.

This question belongs to: Maths Average

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