30 x 2 = 60
18 x 2 = 36
64 x 2 = 128
60 x 2 = 120
28 x 2 = 56
60 + 36 + 128 + 120 + 56 = 400
The volume of the building is 400 m.
"I found that the volume was 400m by multiplying every value given, by 2. Then, I added all of the answers together to get the volume 400m."