It gained 2 lb. because if you subtract 8-6 you would get 2. So Arfus gained 2 lb.
Remark
The number of faces reaching out in the 3rd dimension of the pyramid = the number of edges on the base.
Givens
Number of edges (or sides on the base)= e
Number of faces = f
Formula
F = e + 1 Don't forget that the base is also a face.
