Banking Exams Quant — Question 1786
Question
The average age of 30 students in a class is 12 years. When the teacher's age is included, the average becomes 13 years. Find the teacher's age.
- 40 years
- 42 years
- 43 years
- 45 years
Correct answer
C — 43 years
Explanation (English)
Total age of students = 30 × 12 = 360. New total for 31 people = 31 × 13 = 403. Teacher's age = 403 − 360 = 43 years.
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