Average of 10 numbers 2480. If average of 6 is 2475, average of remaining 4? MCQ with Answer and Explanation

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Average of 10 numbers 2480. If average of 6 is 2475, average of remaining 4?

A. 2485

B. 2486

C. 2490

D. 2487.5

Answer: Option D

Solution (By JKSSB Mock Tests)

Sum10=24800. Sum6=14850. Remaining=9950. Average=2487.5.

This question belongs to: Maths Average

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Question #1

Average of 9 numbers 890. If average of 6 is 885, average of remaining 3?

A. 895

B. 900

C. 898

D. 905

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Correct Answer: Option B

Explanation:
Sum9=8010. Sum6=5310. Remaining=2700. Average=900.

This question belongs to: Maths Average

Question #2

The average of 20 numbers is 45. Later it was found that 52 was wrongly taken as 25. What is the correct average?

A. 46

B. 45.35

C. 47

D. 46.35

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Correct Answer: Option D

Explanation:
Error = 52-25=27 too less. Correct sum = old sum +27. Old sum=20×45=900. New sum=927. Average=927/20=46.35.

This question belongs to: Maths Average

Question #3

The average of first 6 multiples of 7 is

A. 24.5

B. 25

C. 28

D. 21

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Correct Answer: Option A

Explanation:
7*(1+6)/2=7*3.5=24.5.

This question belongs to: Maths Average

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