Multiple choice

Average age of 32 students is 35. If the average increases by 1 when teacher's age is included, then calculate teacher's age.

  1. 32 years

  2. 35 years

  3. 45 years

  4. 68 years

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The total age of 32 students is 32 * 35 = 1120. When the teacher is included, there are 33 people with an average age of 36, so the total age is 33 * 36 = 1188. The teacher's age is 1188 - 1120 = 68 years.

AI explanation

The total age of the 32 students is 32 times 35, which is 1120 years. When the teacher is included, there are 33 people with a new average of 36, making the new total age 33 times 36, or 1188 years. The teacher's age is the difference between the new total and the old total, which is 1188 minus 1120, giving 68 years.

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