Task: Question Answering
Input (English): Problem: the average age of 15 students of a class is 15 years . out of these , the average age of 4 students is 14 years and that of the other 10 students is 16 years . the age of the 15 th student is 
Options: a ) 9 years , b ) 11 years , c ) 14 years , d ) 21 years , e ) 9 years
Output (English): e