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

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. 27

B. 30

C. 33

D. 36

Answer: Option C

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

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Question #1

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If average of 15 numbers is 40 and average of 10 is 45, average of remaining 5?

A. 32

B. 30

C. 25

D. 35

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Correct Answer: Option B

Explanation:
Sum15=600. Sum10=450. Remaining=150. Average=30.

This question belongs to: Maths Average

Question #2

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What is the average of all numbers from 1 to 30 that are divisible by 6?

A. 17.5

B. 18

C. 17

D. 18.5

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Correct Answer: Option B

Explanation:
Numbers:6,12,18,24,30 sum=90, count=5, avg=18.

This question belongs to: Maths Average

Question #3

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Average of 15 numbers 260. If average of 9 is 255, average of remaining 6?

A. 267.5

B. 270

C. 265

D. 268

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Correct Answer: Option A

Explanation:
Sum15=3900. Sum9=2295. Remaining=1605. Average=267.5.

This question belongs to: Maths Average

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