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The average of 20 students is 12 years, if the teacher’s age is included, average increases by one. The age of the teacher is
30 years
33 years
35 years
28 years
Answer with explanation
Answer: Option BExplanation
Average of 20 students = 12 years
Total age of 20 students
= 20 × 12
= 240 years
When teacher included average become 13 years
Now, total age 20 students and teacher
= 13 × 21 = 273 years
∴ Age of teacher
= 273 – 240
= 33 years
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