Task: Question Answering
Input (English): Problem: a hall is 18 meters long and 9 meters wide . if the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls , what is the volume of the hall ( in cubic meters ) ? 
Options: a ) 640 , b ) 758 , c ) 862 , d ) 972 , e ) 1024
Output (English): d