Task: Question Answering
Input (English): Problem: 4 mat - weavers can weave 4 mats in 4 days . at the same rate , how many mats would be woven by 6 mat - weavers in 6 days ? 
Options: a ) 25 , b ) 9 , c ) 39 , d ) 61 , e ) 16
Output (English): b