Task: Question Answering
Input (English): Problem: the average age of an adult class is 40 years . 12 new students with an avg age of 32 years join the class . therefore decreasing theaverage by 4 year . find what was theoriginal strength of class ? 
Options: a ) 11 , b ) 12 , c ) 17 , d ) 19 , e ) 21
Output (English): b