Multiple choice

\text{The average age of 25 students of a class is 13 years. If the age of teacher is also included, the average age is increased by 2 years. Find the age of teacher.}

  1. 64 years

  2. 65 years

  3. 63 years

  4. 70 years
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total age of 25 students = 25 × 13 = 325 years. With teacher included (26 people), average = 15 years, so total = 26 × 15 = 390 years. Teacher's age = 390 - 325 = 65 years. Options A (64), C (63), and D (70) are incorrect.

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