The average age of 12 students is 20 years. If the age of the teacher is included, the average increases by 1 year. What is the age of the teacher? MCQ with Answer and Explanation

Question

The average age of 12 students is 20 years. If the age of the teacher is included, the average increases by 1 year. What is the age of the teacher?

A. 31

B. 34

C. 32

D. 33

Answer: Option D

Solution (By JKSSB Mock Tests)

Total age of students = 12 × 20 = 240. New average = 21. Total age of 13 people = 13 × 21 = 273. Teacher's age = 273 - 240 = 33 years.

This question belongs to: Maths Average

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Question #1

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Average of 10 numbers 2730. If average of 6 is 2725, average of remaining 4?

A. 2737.5

B. 2740

C. 2735

D. 2736

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Correct Answer: Option A

Explanation:
Sum10=27300. Sum6=16350. Remaining=10950. Average=2737.5.

This question belongs to: Maths Average

Question #2

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Average of 7 numbers 55. If average of 4 is 50, average of remaining 3?

A. 58

B. 62.33

C. 65

D. 60

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Correct Answer: Option B

Explanation:
Sum7=385. Sum4=200. Remaining=185. Average≈61.67 approx 62.

This question belongs to: Maths Average

Question #3

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The average of 7 numbers is 30. If each number is divided by 2, what is the new average?

A. 16

B. 15

C. 14

D. 13

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Correct Answer: Option B

Explanation:
New average =30/2=15.

This question belongs to: Maths Average

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