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)?	Choose the correct choice from the following answers
A) 640
B) 758
C) 862
D) 972
E) 1024

Rationale: "2 hl + 2 hw = 2 lw h = lw / ( l + w ) volume = lwh = ( lw ) ^ 2 / ( l + w ) = 972 the answer is d ."
Answer: D