Average of 9 numbers 690. If average of 6 is 685, average of remaining 3? MCQ with Answer and Explanation

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Average of 9 numbers 690. If average of 6 is 685, average of remaining 3?

A. 698

B. 695

C. 705

D. 700

Answer: Option D

Solution (By JKSSB Mock Tests)

Sum9=6210. Sum6=4110. Remaining=2100. Average=700.

This question belongs to: Maths Average

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Question #1

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The average marks of 25 students is 70. If the marks of one student were misread as 80 instead of 60, find the correct average.

A. 70.0

B. 68.8

C. 69.2

D. 69.8

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Correct Answer: Option C

Explanation:
Total sum misread =25×70=1750. Correct sum =1750 -80 +60 =1730. Correct average =1730/25=69.2.

This question belongs to: Maths Average

Question #2

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The average marks of 22 students is 65. If a student with 75 marks leaves and another with 85 joins, what is the new average?

A. 66.0

B. 65.45

C. 65.5

D. 65.2

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Correct Answer: Option B

Explanation:
Sum=22×65=1430. Remove 75: 1430-75=1355. Add 85: 1355+85=1440. New avg=1440/22=65.45.

This question belongs to: Maths Average

Question #3

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Average of numbers from 25 to 50 is

A. 37

B. 38

C. 36.5

D. 37.5

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Correct Answer: Option D

Explanation:
(25+50)/2=37.5.

This question belongs to: Maths Average

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