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. 35

B. 42

C. 45

D. 40

Answer: Option D

Solution (By JKSSB Mock Tests)

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

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Average of 25 numbers 40. If average of 15 is 35, average of remaining 10?

A. 48

B. 46

C. 45

D. 47.5

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Correct Answer: Option D

Explanation:
Sum25=1000. Sum15=525. Remaining=475. Average=47.5.

This question belongs to: Maths Average

Question #2

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Average of 20 numbers 50. If each number is doubled, new average?

A. 100

B. 50

C. 25

D. 75

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Correct Answer: Option A

Explanation:
New average =100.

This question belongs to: Maths Average

Question #3

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The average age of 4 boys is 16 years. If their ages are in ratio 1:2:3:4, what is the age of the oldest boy?

A. 26

B. 24

C. 25.6 years

D. 28

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Correct Answer: Option C

Explanation:
Sum =4×16=64. Ratio sum=10. Oldest = (4/10)×64 =25.6.

This question belongs to: Maths Average

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