The average age of 30 students in a class is 12 years. When the teacher's age is included, the average rises to 13 years. Find the teacher's age. (answer in years)

Question

Accepted Answer

43. Sum of students' ages = 30 × 12 = 360; new total = 31 × 13 = 403; teacher's age = 403 − 360 = 43.

The average age of 30 students in a class is 12 years. When the teacher's age is included, the average rises to 13 years. Find the teacher's age. (answer in years)

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