Multiple choice

The average age of 32 students is 10 years. If the teacher's age is included, the average becomes 11. What is the teacher's age?

  1. 42 years

  2. 52 years

  3. 43 years

  4. 33 years
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total age of 32 students = 32 * 10 = 320. Total age with teacher = 33 * 11 = 363. Teacher's age = 363 - 320 = 43.

AI explanation

The total age of the 32 students is 32 times 10, which equals 320 years. When the teacher is included, there are 33 people with an average age of 11, so the new total age is 33 times 11, which equals 363 years. The teacher's age is the difference between the new total and the original total, so 363 minus 320 equals 43 years.

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