The average age of a class of 30 students is 15 years. If the teacher's age is included, the average becomes 16 years. Find the teacher's age in years.
Show answer & explanation
Correct answer: B
Explanation
Number of students = 30, Average age = 15 years
Total number of individuals (including the teacher) = 31, New average = 16 years
Total age of students = 30 × 15 = 450
Total age (including the teacher) = 31 × 16 = 496
Age of the teacher = 496 − 450 = 46 years