Task: Question Answering
Input (English): Problem: 20 beavers , working together in a constant pace , can build a dam in 6 hours . how many hours will it take 12 beavers that work at the same pace , to build the same dam ? 
Options: a ) 10 . , b ) 4 . , c ) 5 . , d ) 6 , e ) 8 .
Output (English): a