Task: Question Answering
Input (English): Problem: the average age of an adult class is 40 years . 12 new students with an avg age of 34 years join the class . therefore decreasing the average by 4 years . find what was the original average age of the class ? 
Options: a ) 6 , b ) 12 , c ) 16 , d ) 20 , e ) 22
Output (English): a