Pyramid A and Pyramid B have the same height right?
so we'll pretend that the height is 27
For pyramid A the volume is 1/3 x (l x w) x h
or 1/3 x (10 x 20) x 27 = 1800
For pyramid B,
1/3 x (10 x 10) x 27 = 900
1800 รท 900 = 2
Therefore, Pyramid A is twice the size of Pyramid B