Average of 15 numbers is 40. Average of first 8 is 35. Average of last 8 is 45. Find the 8th number. MCQ with Answer and Explanation

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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. 35

C. 42

D. 40

Answer: Option D

Solution (By JKExamLibrary)

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

This question belongs to: Maths Average

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Question #1 Report Error

The average of 27,36,45 is

A. 30

B. 40

C. 36

D. 35

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Correct Answer: Option C

Explanation:
108/3=36.

This question belongs to: Maths Average

Question #2 Report Error

The average of 3 numbers is 12. If the numbers are in the ratio 1:2:3, find the smallest.

A. 4

B. 8

C. 6

D. 10

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Correct Answer: Option C

Explanation:
Sum=3×12=36. Ratio sum=6. Smallest = (1/6)×36=6.

This question belongs to: Maths Average

Question #3 Report Error

The average of 8 numbers is 27. If each number is decreased by 4, what is the new average?

A. 19

B. 27

C. 23

D. 31

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Correct Answer: Option C

Explanation:
New average =27-4=23.

This question belongs to: Maths Average

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