Task: Question Answering
Input (English): Problem: in a vehicle ' s repair shed , 3 men and 8 boys can do a piece of work in 15 days ; 4 men and 9 boys can do the same work in 12 days . then , 5 men and 5 boys can do double the amount of this work in : 
Options: a ) 20 days , b ) 33 days , c ) 24 days , d ) 28 days , e ) none of these
Output (English): c