Multiple choice

In a group the average age of 46 students is 14 years. If teacher's age is included, the average age is increased by 1. What is the teacher's age?

  1. 60 years

  2. 64 years

  3. 62 years

  4. 68 years

  5. 61 years
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Total age of 46 students = 46 × 14 = 644. With teacher, average = 15 for 47 people, so total = 705. Teacher's age = 705 - 644 = 61. The average increases by 1, so teacher must be 14 + 47 = 61.

Keep practicing — related questions