Task: Question Answering
Input (English): Problem: 15 men take 21 days of 8 hrs . each to do a piece of work . how many days of 9 hrs . each would it take for 21 women if 3 women do as much work as 2 men ? 
Options: a ) 30 , b ) 20 , c ) 19 , d ) 29 , e ) 39
Output (English): b