Task: Question Answering
Input (English): Problem: 16 welders work at a constant rate they complete an order in 8 days . if after the first day , 9 welders start to work on the other project , how many more days the remaining welders will need to complete the rest of the order ? 
Options: a ) 5 , b ) 2 , c ) 8 , d ) 4 , e ) 16
Output (English): e