Multiple choice

The average age of 4 students is 9.5. The sum of ages of 3 students is 29. Find the age of the 4th student.

  1. 7 years

  2. 9 years

  3. 10 years

  4. 11 years

  5. 12 years
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total age of 4 students = 4 * 9.5 = 38. Sum of 3 students = 29. Age of 4th student = 38 - 29 = 9.

AI explanation

Using the formula Sum = Average x Count, the total age of all 4 students is 9.5 x 4 = 38. The age of the 4th student is the total sum minus the sum of the other 3 students, which is 38 - 29 = 9. The age of the 4th student is 9 years.

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