The average age of 8 students is 15 years. If the teacher's age is included, the average becomes 18 years. What is the teacher's age? MCQ with Answer and Explanation

Question

The average age of 8 students is 15 years. If the teacher's age is included, the average becomes 18 years. What is the teacher's age?

A. 42

B. 39

C. 45

D. 40

Answer: Option A

Solution (By JKSSB Mock Tests)

Total age of students = 8×15 = 120. Total age including teacher = 9×18 = 162. Teacher's age = 162−120 = 42.

This question belongs to: Maths Average

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Question #1

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The average of 4 numbers is 14. If each number is divided by 2, what is the new average?

A. 9

B. 8

C. 6

D. 7

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Correct Answer: Option D

Explanation:
New average =14/2=7.

This question belongs to: Maths Average

Question #2

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The average marks of 18 students is 68. If a student with 82 marks joins, what is the new average?

A. 68.74

B. 68.2

C. 68.5

D. 69.0

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Correct Answer: Option A

Explanation:
Sum=18×68=1224. New sum=1224+82=1306. New avg=1306/19=68.74.

This question belongs to: Maths Average

Question #3

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Average of 15 numbers 50. If average of 10 is 55, average of remaining 5?

A. 40

B. 45

C. 42

D. 35

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Correct Answer: Option A

Explanation:
Sum15=750. Sum10=550. Remaining=200. Average=40.

This question belongs to: Maths Average

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