There are 15 students in a class. The average age of the students together with the teacher is 15 years, which is 2 years more than the average age of the students alone. What is the age of the class teacher?
A48 years
B50 years
C43 years
D45 years ✓ Correct
Correct answer: (D) 45 years
Explanation
The teacher is 45 years old.
the students' average = 15 - 2 = 13 years.
students' total = 15 x 13 = 195.
total with teacher = 16 x 15 = 240.
teacher = 240 - 195 = 45 years.
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