The average age of 30 students in a class is 14 years. If the age of teacher is also included, the average becomes 15 years, find the age of the teacher.  Choose the correct option.
A) 43 B) 44 C) 45 D) 47 E) 48
Explanation:   If teacher's age is 14 years, there is no change in the average. But teacher has contributed 1 year to all the students along with maintaining his age at 15.   Age of teacher = Average age of all + Total increase in age   = 15 + (1 x 30 ) = 45 years   Answer:45
<result>C</result>
The average age of 30 students in a class is 14 years. If the age of teacher is also included, the average becomes 15 years, find the age of the teacher.