Average age of class of 40 is 15. If teacher 40 included, new average? MCQ with Answer and Explanation

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Average age of class of 40 is 15. If teacher 40 included, new average?

A. 16

B. 15.5

C. 15.6

D. 17

Answer: Option A

Solution (By JKSSB Mock Tests)

Total=600. New total=640. /41≈15.61 approx 16.

This question belongs to: Maths Average

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Question #1

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The average of 9 numbers is 27. If one number is wrongly taken as 45 instead of 27, the incorrect average is:

A. 31

B. 28

C. 30

D. 29

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Correct Answer: Option D

Explanation:
Correct total = 9×27 = 243. Incorrect total = 243+18 = 261. Incorrect average = 261/9 = 29.

This question belongs to: Maths Average

Question #2

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Average of 9 numbers 2140. If average of 6 is 2135, average of remaining 3?

A. 2150

B. 2145

C. 2148

D. 2155

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Correct Answer: Option A

Explanation:
Sum9=19260. Sum6=12810. Remaining=6450. Average=2150.

This question belongs to: Maths Average

Question #3

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Average of 375,500,625 is

A. 495

B. 510

C. 500

D. 490

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Correct Answer: Option C

Explanation:
1500/3=500.

This question belongs to: Maths Average

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