Average of 10 numbers 1980. If average of 6 is 1975, average of remaining 4? MCQ with Answer and Explanation

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Average of 10 numbers 1980. If average of 6 is 1975, average of remaining 4?

A. 1987.5

B. 1990

C. 1985

D. 1986

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum10=19800. Sum6=11850. Remaining=7950. Average=1987.5.

This question belongs to: Maths Average

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Question #1

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A group of 5 friends average age 25. If one leaves, average becomes 24. Age of person who left?

A. 29

B. 28

C. 30

D. 31

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Correct Answer: Option A

Explanation:
Sum5=125. Sum4=96. Left=29.

This question belongs to: Maths Average

Question #2

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Average of 9 consecutive odd numbers is 27. What is the smallest?

A. 19

B. 23

C. 17

D. 21

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Correct Answer: Option A

Explanation:
Middle=27. Smallest=27 -8=19.

This question belongs to: Maths Average

Question #3

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Find the average of the first 6 multiples of 5.

A. 18

B. 17.5

C. 16.5

D. 17

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Correct Answer: Option B

Explanation:
Multiples:5,10,15,20,25,30 sum=105, count=6, avg=17.5.

This question belongs to: Maths Average

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