Multiple choice

The average age of a class of 10 students is 25 years. If a student aged 16 leaves the class, find the new average age.

  1. 25 years

  2. 26 years

  3. 20 years

  4. 10 years
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total age = 10 * 25 = 250. New total age = 250 - 16 = 234. New number of students = 9. New average = 234 / 9 = 26.

AI explanation

The total age of the 10 students initially is 10 multiplied by 25, which equals 250 years. When the 16-year-old student leaves, the new total age becomes 250 - 16 = 234 years. The new average age is the new total divided by the remaining 9 students, which is 234 divided by 9, equaling 26 years.

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