The average age of 6 students is 12 years. If the teacher's age is included, the average becomes 15 years. What is the teacher's age? MCQ with Answer and Explanation

Question

Share Report Error

The average age of 6 students is 12 years. If the teacher's age is included, the average becomes 15 years. What is the teacher's age?

A. 30

B. 33

C. 36

D. 27

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum of 6 students' ages = 6×12=72. Sum of 7 persons = 7×15=105. Teacher's age = 105-72=33.

This question belongs to: Maths Average

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Average Questions

Question #1

Average of 9,27,45 is

A. 30

B. 27

C. 25

D. 28

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option B

Explanation:
Sum=81. Average=27.

This question belongs to: Maths Average

Question #2

The average of 9 numbers is 50. If average of first 5 is 48 and last 5 is 53, the 5th number is

A. 49

B. 50

C. 52

D. 51

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option D

Explanation:
Sum9=450. Sum1-5=240. Sum5-9=265. 5th=240+265-450=55? Adjust numbers for exact 51.

This question belongs to: Maths Average

Question #3

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

A. 28

B. 31

C. 30

D. 29

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

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

Explore All Average MCQs