Task: Question Answering
Input (English): Problem: the average student age of a certain class which has 30 students is 10 . if one student aged 11 go to another class and the age of the class teacher is included the average changes to 11 . what is the age of class teacher ? 
Options: a ) 32 , b ) 41 , c ) 45 , d ) 48 , e ) 50
Output (English): b