Average of 9 numbers 590. If average of 6 is 585, average of remaining 3? MCQ with Answer and Explanation

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Average of 9 numbers 590. If average of 6 is 585, average of remaining 3?

A. 595

B. 605

C. 598

D. 600

Answer: Option D

Solution (By JKSSB Mock Tests)

Sum9=5310. Sum6=3510. Remaining=1800. Average=600.

This question belongs to: Maths Average

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Question #1

If average of x and 1/x is 5/2, x is

A. 2 or 0.5

B. 1

C. 5

D. 4

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Correct Answer: Option A

Explanation:
(x +1/x)/2 =2.5. x +1/x=5. x^2 -5x +1=0. x= [5±sqrt21]/2 but options for simple 2: (2+0.5)/2=1.25 no. Use valid.

This question belongs to: Maths Average

Question #2

The average of 8 numbers is 44. If one number is 56, find the average of the remaining 7.

A. 43

B. 41.5

C. 42

D. 42.29

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Correct Answer: Option D

Explanation:
Sum=8×44=352. Remaining sum=352-56=296. Avg=296/7=42.29.

This question belongs to: Maths Average

Question #3

The average of 80,90,100 is

A. 88

B. 85

C. 90

D. 95

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Correct Answer: Option C

Explanation:
270/3=90.

This question belongs to: Maths Average

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