Multiple choice

The average age of a class of 22 students is 21 years. The average increases by 1 when the teachers age is also included. What is the age of the teacher?

  1. 44

  2. 43

  3. 41

  4. 40
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A Correct answer
Explanation

Total age of 22 students = 22 * 21 = 462. New total with teacher = 23 * 22 = 506. Teacher's age = 506 - 462 = 44.

AI explanation

Using the formula for the average of a combined group, the age of the teacher equals the initial average plus the increase multiplied by the new number of people. The calculation is 21 + (1 times 23), which equals 44 years. The age of the teacher is 44.

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