Task: Question Answering
Input (English): Problem: the average age of an adult class is 40 years . 17 new students with an avg age of 32 years join the class . therefore decreasing the average by 4 year . find what was theoriginal strength of class ? 
Options: a ) 8 , b ) 12 , c ) 15 , d ) 17 , e ) 18
Output (English): d