Task: Question Answering
Input (English): Problem: the avg age of an adult class is 40 years . 12 new students with an avg age of 32 years join the class . therefore decreasingthe avg by 4 year . find what was the original strength of class ? 
Options: a ) 8 , b ) 12 , c ) 15 , d ) 16 , e ) 19
Output (English): b