Task: Question Answering
Input (English): Problem: the edge of three cubes of metal is 3 dm , 4 dm and 5 dm . they are melted and formed into a single cube . find the edge of the new cube ? 
Options: ['a ) 2', 'b ) 8', 'c ) 7', 'd ) 6', 'e ) 9']
Output (English): d